Test Bank for Biochemistry 9th Edition Campbell, Farrell
TEST BANK FOR BIOCHEMISTRY,
9TH EDITION, MARY K.
CAMPBELL, SHAWN O. FARRELL,
OWEN M. MCDOUGAL
Chapter 01 - Biochemistry and the Organization of Cells
1. How do the molecules that play a role in living cells compare to those encountered in organic chemistry?
a. They are the same, just operating in a different context.
b. Biological molecules are organic molecules, but the similarity ends there.
c. Biological molecules aren't similar to organic molecules at all.
d. Biology isn't based on molecules at all, but a "vital force".
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Basic Themes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
2. Which of the following shows the correct order from most simple to most complex:
a. atom, molecule, organelle, macromolecule
b. molecule, atom, macromolecule, organelle
c. tissue, cell, organ
d. atom, macromolecule, tissue, organ
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.2 - Added in 8e
TOPICS: Basic Themes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 11/16/2016 1:13 AM
3. Which of the following best defines organic chemistry?
a. The study of compounds contained in organisms.
b. The study of compounds containing organs.
c. The study of compounds containing carbon and hydrogen and their derivatives.
d. The study of compounds containing elements other than carbon.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
4. Which of the following is NOT one of the primary simple molecules that scientists believe must have
ultimately led to creating living things?
a. ammonia
b. carbon dioxide
c. hydrogen
d. simple carbohydrates
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8e
TOPICS: Basic Themes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 11/16/2016 12:07 AM
5. Which of the following was part of the vital force theory?
a. The compounds found in living things are just like those found in the non-living world.
b. The compounds found in living things are interesting, but can easily be produced in the laboratory.
c. The compounds found in living things can not be produced in the laboratory.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
6. The synthesis of urea from ammonium cyanate.
a. was a critical component of the Miller-Urey experiment.
b. requires a protein as a catalyst.
c. helped dispel the vital force theory.
d. supported the vital force theory.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
7. Which of the following is NOT a Functional Group
a. Amino group
b. Protein
c. Alcohol group
d. Carbonyl group
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7e
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
8. Which of the following functional groups is specific to an alcohol?
a. -NH
b. -OH
c. -C=O
d. C=C
e. O-P
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8e
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 11/23/2016 12:42 AM
9. Which of the following functional groups are not commonly seen in biomolecules?
a. Alkyl halides
b. Amides
c. Carboxylic acids
d. Ethers
e. Phosphate esters
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
10. Which of the following statements regarding biomolecules is false?
a. They contain predominantly ionic bonds.
b. They contain predominantly nonmetallic elements.
c. Carbon is the key element.
d. Specific stereoisomers are essential in most cases.
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
11. All of the following bonds are important in biomolecules, except:
a. C−Cl
b. C−H
c. C−N
d. O−H
e. O−P
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
12. Which of the following statements regarding biopolymers is false?
a. Different sequences of the monomers can lead to different functions.
b. Only soluble polymers can be created from soluble monomers.
c. A wide, almost uncountable variety of polymers can be created from just a few monomers.
d. Different linkages between the monomers can lead to different functions.
e. Biopolymers can fold up into complex shapes.
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
13. Which statement is not correct about peptide nucleic acids, PNA?
a. They are combinations of peptides and nucleic acids.
b. Scientists create them to study the origins of life
c. They were proven to be the first hereditary molecule.
d. They may combine the catalytic properties of proteins with the information transfer ability of nucleic
acid
e. All of these statements apply to PNA.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7e
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
14. According to the big bang theory of the creation of the universe,
a. the universe has been getting cooler since its beginning
b. the initial explosion caused the creation of all of the elements of the periodic table
c. carbon is the most abundant element in the universe
d. the earth could be no older than 1 billion years
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7e
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
15. In its earliest stages, which atoms were present in the universe?
a. carbon, hydrogen, and oxygen
b. hydrogen, helium, and lithium
c. nitrogen, sulfur, and phosphorous
d. uranium, polonium, and radium
e. helium, neon, and argon
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
16. How are the majority of elements thought to have been formed?
a. By thermonuclear reactions that normally take place in stars.
b. In explosions of stars.
c. By the action of cosmic rays outside the stars since the formation of the galaxy.
d. All of the choices are true
e. None of the choices; all the elements were present from the initial Big Bang.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
17. What is the chemical formula for ozone?
a.
O
2
b.
O
3
c.
NH
3
d.
H
2
S
e.
CH
4
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
18. It is generally believed that the following gas was missing in the primordial atmosphere:
a.
H
2
b.
CO
2
c.
CH
4
d.
NH
3
e.
O
2
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
19. A catalyst
a. increases the rate of a chemical reaction
b. increases the amount of product obtained in a chemical reaction
c. decreases the amount of product obtained in a chemical reaction
d. none of the choices
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
20. The genetic coding material is
a. protein
b. DNA
c. polysaccharide
d. lipid
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
21. The presence of two anhydride linkages is an important feature of
a. ATP
b. proteins
c. glucose
d. carbon monoxide
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8e
TOPICS: Origins of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 11/16/2016 1:16 AM
22. Which of the following best describes the results of the Miller-Urey experiment?
a. It proved that DNA is the genetic material.
b. It produced proteins under conditions simulating the early Earth.
c. It created living cells from non-living materials.
d. It produced some simple organic compounds from a mixture of gases presumed to have existed in the
early atmosphere.
e. All of these results of the Miller-Urey experiment.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
23. The idea that a coding system and a catalysis system came about separately and then combined to form life as
we know it is known as
a. the origin of life
b. the big bang theory
c. the double origen theory
d. the theory of evolution
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8e
TOPICS: Origens of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 11/16/2016 1:16 AM
24. The genetic code
a. determines the order of sugars in a polysaccharide
b. has no effect on the sequence of amino acids in proteins
c. is the means by which the "blueprint" for living organisms is passed from one generation to the next
d. cannot be understood by currently available experimental methods
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
25. Biological catalysts are
a. proteins exclusively
b. RNA exclusively
c. DNA exclusively
d. some proteins and some RNA
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
26. The main difference between prokaryotic and eukaryotic cells is the existence of _____ in eukaryotes.
a. the nucleus
b. ribosomes
c. DNA
d. RNA
e. cell walls
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Prokaryotes & Eukaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 11/29/2016 6:44 AM
27. All of the following features are common to all living organisms, except:
a. Biomolecules
b. Metabolic pathways
c. Cellular structures
d. DNA sequences
e. RNA molecules
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Prokaryotes & Eukaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
28. All eukaryotic organisms
a. are multicellular
b. have a nucleus
c. have chloroplasts
d. have a cell wall
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7e
TOPICS: Prokaryotes & Eukaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
29. Cell membranes
a. are found in plants, but not in animals
b. consist mainly of sugars
c. do not allow transport into or out of the cell
d. separate the cell from the outside world
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Prokaryotes & Eukaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
30. Which of the following is not a subcellular organelle?
a. nucleus
b. mitochondrion
c. endoplasmic reticulum
d. cytoskeleton
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7e
TOPICS: Prokaryotes & Eukaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
31. Energy-yielding oxidation reactions take place in eukaryotic
a. nuclei.
b. ribosomes.
c. mitochondria.
d. endoplasmic reticula.
e. cell walls.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Prokaryotes & Eukaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
32. Prokaryotic cells
a. do not have a well defined nucleus
b. are smaller than eukaryotic cells
c. do not have internal membranes
d. all of the above
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Prokaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
33. Prokaryotes
a. contain ribosomes
b. do not have a cell membrane
c. contain mitochondria
d. none of the above
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Prokaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
34. Ribosomes
a. are the site of photosynthesis
b. are the site of protein synthesis
c. are never bound to membranes
d. cannot be seen in the electron microscope
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Prokaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
35. 11 Ribosomes are made up of
a. RNA and proteins
b. DNA and proteins
c. RNA and DNA
d. proteins and carbohydrates
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Prokaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
36. Which of the following cellular components is commonly found in bacteria?
a. Nucleus
b. Ribosomes
c. Chloroplasts
d. Mitochondria
e. More than one of these is characteristic of bacteria.
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Prokaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
37. Which organelle does not contain DNA?
a. Nucleus
b. Mitochondrion
c. Rough Endoplasmic Reticulum
d. Chloroplast
e. All of these organelles contain DNA
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
38. Which cell component is composed of RNA and protein?
a. Nucleus
b. Mitochondrion
c. Endoplasmic Reticulum
d. Chloroplast
e. Ribosome
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
39. Which cell component has cristae?
a. Nucleus
b. Mitochondrion
c. Endoplasmic Reticulum
d. Chloroplast
e. Ribosome
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
40. Which organelle is involved in the synthesis of ATP?
a. Nucleus
b. Mitochondrion
c. Chloroplast
d. ATP is synthesized in both mitochondria and chloroplasts.
e. ATP is synthesized in all three organelles.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
41. Eukaryotic DNA
a. is found in the nucleus
b. is found in the mitochondrion
c. is found in the chloroplast
d. all of the above
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
42. Which of the following statements about eukaryotic nuclei is FALSE?
a. They are separated from the rest of the cell by a single membrane.
b. They contain RNA.
c. They contain chromatin.
d. They play a role in genetics.
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
43. Which cell component does not have a double membrane?
a. Nucleus
b. Lysosome
c. Rough Endoplasmic Reticulum
d. Chloroplast
e. Mitochondrion
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
44. Which of the following statements about eukaryotic mitochondria is TRUE?
a. They play a role in genetics.
b. They are the site of photosynthesis in green plants.
c. They have an inner and an outer membrane.
d. They only occur in animals, not plants.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
45. Which is not a property of ribosomes?
a. They are an assembly of polypeptides and RNA.
b. They are found in both prokaryotic and eukaryotic cells.
c. They function as agents in the biosynthesis of proteins.
d. They are found in the cytoplasm and smooth endoplasmic reticulum.
e. All of these statements are true about ribosomes.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
46. Which cell component is able to capture the energy of light?
a. Nucleus
b. Lysosome
c. Rough Endoplasmic Reticulum
d. Chloroplast
e. Mitochondrion
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
47. Which cell component contains many hydrolytic enzymes?
a. Nucleus
b. Lysosome
c. Rough Endoplasmic Reticulum
d. Chloroplast
e. Mitochondrion
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
48. The following cellular component is characteristic of eukaryotic cells:
a. Nucleus
b. Ribosomes
c. Chloroplasts
d. Mitochondria
e. More than one of these is characteristic of eukaryotic cells.
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
49. The following cellular component is the defining component of eukaryotic cells:
a. Nucleus
b. Ribosomes
c. Chloroplasts
d. Mitochondria
e. Cell membranes
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
50. The mitochondrial matrix
a. is the location of enzymes needed for oxidation reactions
b. contains an array of microtubules
c. is part of the endoplasmic reticulum
d. lies between the inner and outer mitochondrial membrane
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
51. The following cellular component is the defining component of most plant cells:
a. Nucleus
b. Ribosomes
c. Chloroplasts
d. Mitochondria
e. Cell walls
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
52. The endoplasmic reticulum
a. is part of a continuous membrane system throughout the cell
b. occurs in two forms, rough and smooth
c. can have ribosomes bound to it
d. all of the above
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
53. Chloroplasts
a. contain no DNA
b. are bounded by a single membrane
c. are relatively small organelles
d. are the site of photosynthesis in green plants
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
54. The Golgi apparatus
a. occurs in prokaryotes
b. is involved in secretion of proteins from the cell
c. is part of the chloroplast
d. is the site of protein synthesis
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
55. Lysosomes, peroxisomes, and glyoxysomes are
a. sites of cell damage
b. important in mitosis
c. specialized organelles
d. a part of the rough endoplasmic reticulum
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
56. Cell walls
a. occur in plants and bacteria
b. occur in plants and animals
c. occur only in plants
d. occur only in bacteria
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
57. Animal cells do not contain
a. a nucleus
b. mitochondria
c. chloroplasts
d. lysosomes
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
58. A kind of cellular structure present in plant cells but not in human cells is
a. the endoplasmic reticulum
b. a cell wall
c. ribosomes
d. a plasma membrane
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
59. Which of the following organelles does not have a double membrane?
a. mitochondrion
b. nucleus
c. endoplasmic reticulum
d. chloroplast
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: Eukaryotic Structure
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
60. Which of these kingdoms includes only prokaryotic organisms?
a. Animals
b. Fungi
c. Monera
d. Plants
e. Protista
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: How we classify eukaryotes and prokaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
61. Which of these eukaryotic kingdoms consists primarily of unicellular organisms?
a. Animals
b. Fungi
c. Plants
d. Protista
e. Both fungi and protista.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: How we classify eukaryotes and prokaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
62. In the Five Kingdom classification system, human beings would be considered
a. animals.
b. protists.
c. monera.
d. fungi.
e. none of the above.
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: How we classify eukaryotes and prokaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
63. In the Five Kingdom classification system, Escherichia coli would be considered
a. animals.
b. protists.
c. monera.
d. none of the above.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5e
TOPICS: How we classify eukaryotes and prokaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
64. The endosymbiotic theory describes the origin of
a. the nucleus & ribosomes.
b. the Golgi and endoplasmic reticulum.
c. lysosomes and the cytoskeleton.
d. mitochondria & chloroplasts.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: How we classify eukaryotes and prokaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
65. Which of following provides evidence for the endosymbiotic theory describing the origin of mitochondria &
chloroplasts?
a. These organelles have their own nuclei.
b. These organelles have their own endoplasmic reticulum.
c. These organelles have their own lysosomes.
d. These organelles have their own DNA.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6e
TOPICS: How we classify eukaryotes and prokaryotes
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
66. According to thermodynamics, favored processes are
a. ones that require energy.
b. ones that release energy.
c. oxidations.
d. reductions.
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Biochemical Energetics
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
67. Which of the following is/are true?
a. The hydrolysis of ATP releases energy.
b. Favorable reactions are always fast.
c. The hydrolysis of ATP requires the input of oxygen
d. The hydrolysis of ATP yields more energy per molecule than the reaction of any other compound
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7e
TOPICS: Biochemical Energetics
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
68. The aerobic combustion of glucose to yield carbon dioxide and water
a. is thermodynamically favorable
b. requires oxygen
c. has a negative Gibb’s free energy
d. all of these are true
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7e
TOPICS: Energy and Change
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
69. A spontaneous reaction is
a. exergonic.
b. endergonic.
c. at equilibrium.
d. none of the above.
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.6 - Modified in 7e
TOPICS: Spontaneity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
70. The heat of a reaction at constant pressure is
a. its change in entropy.
b. its change in enthalpy.
c. its change in free energy.
d. its spontaneity.
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Life and Thermodynamics
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
Match the macromolecules with the monomeric unit in each.
a. nucleic acids
b. proteins
c. carbohydrate
QUESTION TYPE: Matching
HAS VARIABLES: False
TOPICS: Origin of Life
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED: 12/23/2013 2:14 PM
71. amino acid
ANSWER: b
POINTS: 1
72. monosaccharide
ANSWER: c
POINTS: 1
73. nucleotide
ANSWER: a
POINTS: 1
74. Identify the class of basic biomolecules represented by the following structure.
a. Carbohydrates
b. Amino acids
c. Nucleotides
d. Lipids
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 11/25/2016 4:56 AM
DATE MODIFIED: 11/25/2016 5:00 AM
75. Explain the significance of functional groups in biochemistry.
ANSWER:
Biomolecules have characteristic functional groups that determine their reactions. Many of
these functional groups contain oxygen and nitrogen, which are among the most
electronegative elements. As a result, many of these functional groups are polar, and their
polar nature plays a crucial role in their reactivity.
POINTS: 1
QUESTION TYPE: Essay
HAS VARIABLES: False
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 11/25/2016 5:01 AM
DATE MODIFIED: 11/25/2016 5:31 AM
76. Which of the following biomolecules forms the molecular currency of the cell, adenosine triphosphate
(ATP)?
a. Nucleotides
b. Esters
c. Amino acids
d. Lipids
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 11/25/2016 5:23 AM
DATE MODIFIED: 11/25/2016 5:30 AM
77. Carbohydrates can be represented by a general formula of _____.
a.
R-CH
n
(NH
2
)-COOH
b.
CH
3
(CH
2
)
n
CO
2
H
c.
C
n
H
2n-2
d.
(CH
2
O)
n
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 11/25/2016 5:32 AM
DATE MODIFIED: 11/25/2016 5:34 AM
78. Lipids are characterized by poor solubility in water most of their structure is composed of _____.
a. a central carbon atom bonded to a carboxyl group, a hydrogen group, and a variable group, called the
R group
b. a five-carbon sugar, a nitrogen-containing ring, and one or more phosphate groups
c. long chains of hydrocarbons
d. straight sugar chains that forms cyclic structures in a solution
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Chemical Foundations of Biochemistry
DATE CREATED: 11/25/2016 5:36 AM
DATE MODIFIED: 12/2/2016 8:51 AM
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
Chapter 02 - Water: The Solvent for Biochemical Reactions
1. The tendency for an atom to attract electrons to itself in a chemical bond is called
e
2. If atoms with greatly differing electronegativities form a bond, that bond will be
a. polar.
b. nonpolar.
c. amphipathic.
d.
acidic.
e
3. Many of the properties of water can be accounted for by the fact that
a. it is polar
b. it forms hydrogen bonds
a. polarity.
b. electronegativity.
c. hydrophilicity
d.
electrophilicity.
c. it is a bent molecule
d.
all of these are true
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.6 - Modified in 7e
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
4. Which of the following is true about ionic compounds?
a. They are more likely to dissolve in non-polar solvents than covalent compounds.
b. They always dissolve completely in water.
c. They never dissolve in polar solvents.
d.
Some of them dissolve completely in water or other polar solvents, while others do not.
e
5. Which of the following is a correct listing of electronegativity values, from low to high?
a. C, H, O, N
b. N, H, O, C
c. H, C, N, O
d.
H, C, O, N
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
6. Which of the following elements has the highest electronegativity?
a. C
b. H
c. N
d. O
e.
P
ANSWER: d
POINTS: 1
QUESTION TYPE:
Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
e
7. The water molecule is polar because:
a. Electrons are not distributed symmetrically in the molecule.
b. The hydrogen atoms are found on one "side" of the molecule.
c. Hydrogen is less electronegative than oxygen.
d. The hydrogen atoms are found on one "side" of the molecule and hydrogen is less electronegative than
oxygen.
e.
All of these are correct.
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
8. Which of the following molecules is polar?
a.
CCl
4
b.
CH
4
c.
CO
2
d.
NH
3
e.
None of these molecules is polar.
e
9. Which of the following molecules is amphipathic?
a. sodium chloride
b. acetic acid
c. benzene
d.
palmitic acid
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES:
False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7
TOPICS:
Water and Polarity
e
10. Which of the following classes of compounds is hydrophilic?
a. Sugars
b. Fatty acids
c. Amino acids
d. Sugars and amino acids.
e.
All of these
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
11. Which of the following classes of compounds is hydrophobic?
a. Table Salt
b. Cholesterol
c. Phosphate esters
d. Cholesterol and phosphate esters.
e.
All of these are hydrophobic.
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
12. Which of the following molecules has polar bonds but is itself not polar?
a.
NH
3
b.
CO
2
c.
CH
4
d.
H
2
O
e
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
13. When a carboxylate side-chain of one amino acid in a protein is in close proximity to a charged amino group of
another amino acid, we call the resulting interaction a(n)
a. ion - dipole bond
b. ionic bond
c. van der Waal’s bond
d.
salt bridge
e
14. A London dispersion force is another name for a(n)
a. induced dipole - induced dipole bond
b. ionic bond
c. covalent bond
d.
non-polar bond
e
15. Ionic compounds and polar covalent compounds tend to dissolve in water because of
a. ion-dipole and dipole-dipole interactions
b. dipole-induced dipole interactions
c. van der Waals bonds
d.
hydrophobic interactions
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
16. Which of the following is not considered a van der Waal’s force?
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
a. dipole - dipole bond
b. dipole - induced dipole bond
c. induced dipole - induced dipole bond
d.
ion - dipole bond
e
17. A micelle is a structure which
a. aggregates with other micelles in water.
b. has its polar groups on the outside and non-polar groups on the inside when in water.
c. explains how soaps and detergents work.
d.
has its polar groups on the outside and non-polar groups on the inside when in water and explains how soaps
and detergents work.
e.
All of these are true.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.6 - Modified in 7e
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
18. Which of the following compounds is most likely to form a micelle?
a. Acetic acid.
b. Glucose.
c. Glycerol.
d. Sodium palmitate.
e.
Sodium phosphate.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.7 - Modified in 8e
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
19. The substance most likely to form a micelle is
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
a. acetic acid
b. sodium palmitate
c. methyl alcohol
d.
acetone
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
20. Molecules which contain both hydrophilic and hydrophobic regions are:
a. Amphipathic
b. Amphiphilic
c. Able to form micelles
d. Both amphipathic and amphiphilic
e.
All of these
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
21. How do hydrogen bonds tend to affect the melting and boiling points of substances?
a. They tend to increase both melting and boiling points.
b. They tend to decrease both melting and boiling points.
c. They tend to increase melting points and decrease boiling points.
d. They tend to decrease melting points and increase boiling points.
e.
They do not have any affect on either melting or boiling points.
e
22. Hydrogen bonds
a. play an important role in the solvent properties of water
b. are not involved in protein structure
c.
play a role in the properties of DNA, but not of RNA
d. give water a lower boiling point than expected
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
23. Which of the following molecules will not form hydrogen bonds?
a.
CH
4
b.
NH
3
c.
H
2
O
d.
HF
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
24. How does the strength of hydrogen bonds compare with covalent bonds?
a. Hydrogen bonds are much stronger than covalent bonds.
b. Hydrogen bonds are much weaker than covalent bonds.
c. Hydrogen bonds and covalent bonds have similar strengths.
d.
The question cannot be answered without knowing which covalent bonds are being referred to
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.6 - Modified in 7e
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
25. A hydrogen bond is a special type of
a. dioole - dipole bond
b. induced dipole - induced dipole bond
c. covalent bond
d.
ionic bond
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES:
False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8
TOPICS: Hydrogen bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
11/23/2016 2:21 AM
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
e
26. Which of the following is true regarding hydrogen bonds.
a. They can only form between two different molecules
b. They are important in protein folding but not DNA structure
c. They are important in DNA structure but not protein folding
d.
They can be found within a single molecule
e
27. In a hydrogen bond
a. three atoms lie in a straight line
b. there is stronger bonding than in a covalent bond
c. unpaired electrons play no role
d.
none of the above
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
28. The non-covalent interaction below associated with the strongest force in aqueous solution is
a. dipole-induced dipole
b. hydrophobic interactions
c. hydrogen bonding
d.
van der Waals forces
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
29. Which of the following statements about hydrogen bonds is false?
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
a. The donor is a hydrogen atom bonded to a less electronegative atom then hydrogen.
b. The more linear the bond, the stronger the attraction.
c. The acceptor must contain a non-bonded pair of electrons.
d.
It is a type of non-covalent bond.
e
30. True hydrogen bonds can NOT form between hydrogen and this element:
a. N
b. F
c. C
d. O
e.
All of these elements can form hydrogen bonds.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
31. What is the maximum number of hydrogen bonds a single water molecule can form?
a. 1
b. 2
c. 3
d. 4
e.
5
e
32. Which of the following characteristics makes for a good hydrogen bond acceptor?
a. a high electronegativity
b.
a nonbonding pair of electrons
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8
TOPICS: Hydrogen bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
c. both of these
d.
neither of these
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.6 - Modified in 7e
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
33. Which of the following characteristics makes for a good hydrogen bond donor?
a. a high electronegativity
b. a nonbonding pair of electrons
c. both of the above
d.
neither of the above
e
34. Which of the following properties of water are related to its ability to form hydrogen bonds?
a. boiling point
b. melting point
c. density
d. solvent potency
e.
all of the choices
e
35. Hydrogen bonds explain which of the following properties of water?
a. Water is a great solvent for all ionic and polar molecules.
b. Water has high melting and boiling points for its small size.
c. Ice expands when frozen.
d.
Both the abnormal melting and freezing points and that ice expands when frozen.
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
e. Hydrogen bonds explain all of these properties.
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
36. Hydrogen bonds can only form when the hydrogen atom is involved in a polar bond.
a. True
b.
False
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
37. Which of the following is a true statement?
a. most substances contract when they freeze.
b. water expands when it freezes.
c. hydrogen bonding is related to water’s tendency to expand as it freezes.
d.
all of these are true
e
Exhibit 2A
The structure of ATP with various groups labeled.
Group III is the entire phosphate group.
38. Refer to Exhibit 2A. Which of the functional groups cannot function as a hydrogen donor to water?
a. I
b. II
c. III
d. IV
e.
All can donate a hydrogen to water.
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2A
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
39. Refer to Exhibit 2A. Which of the functional groups is the most electrophilic?
a. I
b. II
c. III
d. IV
e.
The answer cannot be determined without further information.
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2A
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
40. Refer to Exhibit 2A. Which of the groups could not act as a proton acceptor in a hydrogen bond?
a. I
b. II
c.
III
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
H
d. IV
e.
All can accept a hydrogen in a hydrogen bond.
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2A
TOPICS: Hydrogen Bonds
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
41. Is water an acid or a base?
a. Water is an acid.
b. Water is a base.
c. Water is both an acid and a base.
d.
Water is neither an acid nor a base.
e
42. For an acid that undergoes this reaction:
HA ↔
+
+ A−
K
a
=
a.
+
[H ][A−]/[HA]
b.
+
[H ][HA]/[A−]
c.
[HA][A−]/[
+
H ]
d.
[A−]/[HA][
+
H ]
e.
+
[H ]/[HA][A−]
e
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
43. Which will dissociate most in water, a weak acid or a strong acid?
a. A weak acid.
b. A strong acid
c. They should dissociate about the same.
d.
It's impossible to predict.
e
44. Bases are
a. proton donors.
b. proton acceptors.
c. hydrogen bond donors.
d.
hydrogen bond acceptors.
e
45. Which has the greater K
a
, a weak acid or a strong acid?
a. A weak acid.
b. A strong acid
c. They should dissociate about the same.
d.
It's impossible to predict.
e
46. Which has the greater pK
a
, a weak acid or a strong acid?
a. A weak acid.
b.
A strong acid
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
c. They should dissociate about the same.
d.
It's impossible to predict.
e
47. The dissociation constant for an acid with a pK
a
value of 6.0 is
a.
1 × 10
6
b.
−1 ×
6
10
c.
1 × 10
6
d.
−1 × 10
6
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
48. A buffer solution at pH 10 has a ratio of [HA]/[A−] of 10. What is the pK
a
of the acid?
a. 8
b. 9
c. 10
d. 11
e.
12
e
6
49. The dissociation constant for an acid is 1 × 10− . What is its pK
a
?
a. −6
b. 6
c. 0.6
d.
−0.6
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.6 - Modified in 7e
TOPICS: Acids, Bases, and pH
NOTES: Answer was incorrect in 6e
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
50. The pH of a solution of 0.04 M HCl is:
a. 4
b. 1.4
c. 0.4
d. 0.04
e.
The pH cannot be determined
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
51. The pOH a solution of 0.04 M HCl is:
a. 1.4
b. 10
c. 12.6
d. 13.6
e.
The pOH cannot be determined
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
52. An HCl solution has a pH = 3. If you dilute 10 mL of the solution to 1000mL, the final pH will be:
a. 1.0
b. 2.0
c. The pH does not change.
d. 4.0
e.
5.0
ANSWER: e
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.1 - New in 6
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
[H ]
[H ]
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
53. If a solution has a pH = 9.6, the
+
is
a.
2.5 ×
10
10
b. 9.6 M
c. 2.5 M
d.
2.5 × 10
10
M
e.
9.6 × 10
10
M
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
54. What is the pH of a solution with
+
= 10 mM?
a. 10
b. 1
c. 2
d.
−2
e
55. Calculate the final pH of a solution made by the addition of 10 mL of a 0.5 M NaOH solution to 500 mL of a 0.4 M
HA originally at pH = 5.0 (pKa = 5.0) Neglect the volume change.
a. 6.10
b. 5.09
c. 7.00
d.
5.55
ANSWER: d
POINTS: 1
QUESTION TYPE:
Multiple Choice
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
a.
10
14
b.
10
7
c.
10
0
d.
10
7
e.
10
1
[H ]
HAS VARIABLES: False
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
56. If a solution has a pH = 6, the
+
is
a. 6 M
b.
10
6
M
c.
10
6
M
d.
0.6 M
e
57. What is the pH of an acetic acid solution where the concentration of acetic acid is 2 mM and the concentration of
sodium acetate is 20 mM. The pK
a
of acetic acid is 4.76.
a. 5.76
b. 10.6
c. 12.6
d.
8.8
e
58. The ion product constant for water (K
w
) is equal to:
4
ANSWER: e
POINTS: 1
QUESTION TYPE:
Multiple Choice
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
HAS VARIABLES: False
TOPICS: Acids, Bases, and pH
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
59. In a titration of a weak acid by a strong base
a. two equivalents of base are always needed to neutralize all the acid present
b. the equivalence point cannot be defined exactly
c. there is a region in which the pH changes slowly
d.
the equivalence point depends on the nature of the added base
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
60. A solution at pH 7 contains a weak acid, HA. The pK
a
of the acid is 6.5. What is the ratio of [A−]:[HA]?
a. 1:3
b. 1:1
c. 3:1
d.
10:1
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
61. When does a weak acid buffer best?
a.
From one pH unit below its pK
a
to its pK
a
.
b.
From its pK
a
to one pH unit above its pK
a
.
c.
Within one pH unit of its pK
a
, both above and below.
d.
Weak acids do not make good buffers at all.
e
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
62. The inflection point of the titration curve for a weak monoprotic acid is equal to its pK
a
a. True
b.
False
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
NOTES: Answer was incorrect in 6e
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
63. Which of the following is true?
a.
The pH of a solution where the A− to HA ratio is 1 has a pH = pK
a
.
b.
If the pH does not equal the pK
a
, the solution is not a buffer.
c.
The best buffer for any experiment will always have a pH equal to the pK
a
.
d.
If a buffer has more weak acid than conjugate base, the pH will be higher than the pK
a
.
e
+
64. Using the Henderson-Hasselbalch equation, calculate the pH of an ammonia buffer when the NH
3
:NH
4
moles:0.6 moles. (pK = 9.75)
ratio is 0.4
a. 7.40
b. 9.07
c. 9.25
d. 9.43
e.
11.05
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
+
65. An ammonia buffer contains NH
3
:NH
4
0.01 moles of HCl to this buffer?
a. 8.98
in a ratio of 0.4 moles:0.6 moles (pK = 9.75). What will be the pH if you add
Chapter 02 - Water: The Solvent for Biochemical Reactions
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.8 - Modified from 6
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
b. 9.04
c. 9.25
d. 9.46
e.
9.52
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
66. The ratio of a weak acid and its conjugate base at the point of maximum buffering capacity is
a. 1/1
b. 1/10
c. 10/1
d.
no definite ratio is needed
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
67. Which substance would be the best buffer at pH 8 if it had to be able to buffer against either acid or base?
a.
one with a pK
a
of 7
b.
one with a pK
a
of 8
c.
one with a pK
a
of 9
d.
The pK
a
of a substance doesn't tell you whether it would be a good buffer at this pH.
e
68. Buffering capacity refers to
a. the effectiveness of commercial antacids
b. the extent to which a buffer solution can counteract the effect of added acid or base
c. the pH of a buffer solution
d.
the molecular weight of the substance used as a buffer
Chapter 02 - Water: The Solvent for Biochemical Reactions
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.5 - Modified from 5
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
69. If the pH of 1 liter of a 1.0 M carbonate buffer is 7.0, what is the molar ratio of H
2
CO
3
to HCO
3
−? (pK = 6.37)
a. 0.234
b. 4.27
c. 6.37
d. 7.00
e.
10.20
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
70. Consider a reaction that produces a significant amount of hydrogen ion and is to be carried out a pH 7. Only two acids
are available for making the buffer solution. The pK
a
values for acids A and B are 6.3 and 7.3, respectively. Which acid
would serve as the optimum buffer for this reaction? Or would carrying out the reaction in water simply serve as well?
a. acid A
b. acid B
c. water
d.
both acids would be equally effective
e
71. Which of the following acids would serve as a good buffer for a reaction at pH = 8.0?
K
a
I. acetic acid
1.76 × 10
5
II.
H
2
PO
4
−
6.31 × 10
8
III. bicarbonate
5.6 × 10
11
IV. TRIS
5.01 × 10
9
−
Chapter 02 - Water: The Solvent for Biochemical Reactions
a. I
b. II
c. III
d.
IV
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
72. If the pH of 1 liter of a 1.0 M carbonate buffer is 7.0, what is actual number of moles of H
2
CO
3
and HCO
3
−? (pK =
6.37)
moles of H
2
CO
3
moles of HCO
3
−
I. 0.86
0.14
II. 0.81 0.19
III. 0.76 0.24
IV. 0.19 0.81
V. 0.14 0.86
a. I
b. II
c. III
d. IV
e.
V
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
73. A buffer solution
a. is used to control the pH of a solution
b. contains at least 100 times more of a weak acid than its conjugate base
c. contains at least 100 times less of a weak acid than its conjugate base
d.
always has a pH of 7
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Titration Curves
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
Chapter 02 - Water: The Solvent for Biochemical Reactions
74. The main intracellular buffer system is
a.
H
3
PO
4
/H
2
PO
4
−
b.
H
2
PO
4
−/ HPO
2
4
c.
HPO
4
2
−
/PO
3
4
d.
H
3
PO
4
/PO
3
4
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
Exhibit 2B
Contains information on the pK's of some common buffers.
Buffer pK1 pK2
pK3
Acetate 4.75
Ammonia 9.25
Carbonic acid 6.37
10.20
Citric acid 3.09
4.75
5.41
Formic Acid 3.75
Phosphoric acid 2.14
7.20
12.4
Pyruvic acid 2.50
Tris 8.3
75. Refer to Exhibit 2B. The enzyme lysozyme has an optimum pH close to 5. A suitable buffer would be:
a. Acetate
b. Carbonate
c. Phosphate
d. Pyruvate
e.
None of these is a suitable buffer for this reaction.
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2B
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
76. Refer to Exhibit 2B. An ammonium buffer would work well at this pH:
a. 5.6
b. 7.0
c. 9.0
d. 11.0
e.
None of these
Chapter 02 - Water: The Solvent for Biochemical Reactions
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2B
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
77. Refer to Exhibit 2B. A carbonate buffer would work well at this pH:
a. 4.0
b. 6.0
c. 8.0
d. 10.0
e.
6.0 and 10.0
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2B
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
78. Refer to Exhibit 2B. A phosphate buffer would work well at this pH:
a. 5.0
b. 7.0
c. 8.0
d. 10.0
e.
7.0 and 8.0
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2B
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
79. Refer to Exhibit 2B. Which of the following would make the best buffer at pH =10.0?
a. Acetic acid and sodium acetate
b. Tris and its acid form
c.
H
2
CO
3
and NaHCO
3
d.
Na
2
HPO
4
and NaH
2
PO
4
e.
NaHCO
3
and Na
2
CO
3
Chapter 02 - Water: The Solvent for Biochemical Reactions
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2B
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: e
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
PREFACE NAME: Exhibit 2B
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
80. Which of the following is important to know when deciding if a given buffer will be effective for an experiment?
a.
the pK
a
of the buffer compound
b. the buffer capacity
c. the concentration of the buffer
d. whether the experiment is likely to generate hydrogen ions or hydroxide ions
e.
all of these are important considerations
e
81. Nonphysiological buffers such as HEPES and PIPES have come into common use because
a. they are inexpensive
b. they can be prepared much more easily than other buffers
c. they have less tendency to interfere with reactions
d.
they contain nitrogen
ANSWER: c
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
82. Buffers which lack biological activity and are unlikely to interfere with any biochemical reactions include:
a. Tris.
b. Hepes.
c. Phosphate.
d. Both Tris and HEPES.
e.
All of these.
ANSWER: d
Chapter 02 - Water: The Solvent for Biochemical Reactions
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.4 - New in 7
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
LEARNING OBJECTIVES: CAFA.BIOC.15.3 - New in 8
TOPICS:
Buffers
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
83. Which of the following is not true?
a. A buffer is a solution which maintains a solution at a neutral pH
b. Buffer solutions are made to resist change in pH
c. Zwitterion buffers are less likely to interfere with biological reactions than non-zwitterions
d.
HEPES is a zwitterion buffer
e
84. The main blood buffer system is
a.
H
2
CO
3
/HCO
3
−
b.
HCO
3
−/CO
3
2
c.
H
2
CO
3
/CO
2
3
d.
none of the above
ANSWER: a
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Buffers
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
85. Buffers work to maintain pH because
a. they obey LeChatlier’s principle
b. weak acids cannot change the pH of a solution
c. weak bases added to strong bases neutralize each other
d.
they destroy the hydrogen ion that is added
e
Chapter 02 - Water: The Solvent for Biochemical Reactions
DATE CREATED: 12/23/2013 2:14 PM
DATE MODIFIED:
12/23/2013 2:14 PM
86. Explain why carbon dioxide is nonpolar.
ANSWER: A carbon dioxide molecule has two C=O polar bonds. However, the bonds in the molecule may be
polar, but the molecule itself can be nonpolar because of its geometry. The CO
2
molecule is linear;
therefore, the attraction of the oxygen for the electrons in one bond is cancelled out by the equal and
opposite attraction for the electrons by the oxygen on the other side of the molecule, resulting in a
nonpolar molecule.
POINTS: 1
QUESTION TYPE: Essay
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 11/25/2016 5:41 AM
DATE MODIFIED:
11/25/2016 5:43 AM
87. Which of the following statements is true of dipole-induced dipole interactions?
a.
They occur between molecules that are dipoles, with the partial positive side of one molecule attracting the
partial negative side of another molecule.
b.
They involve a permanent dipole inducing a transient dipole in a nonpolar molecule.
c.
They are the attraction between two molecules, lacking dipoles, bumping into each other and distorting each
other’s electron cloud.
d.
They give rise to a London dispersion force between transient-induced dipoles.
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Water and Polarity
DATE CREATED: 11/25/2016 5:44 AM
DATE MODIFIED:
11/25/2016 5:46 AM
88. Distinguish between the hydrogen bonding found in liquid water and ice.
ANSWER: In liquid water, hydrogen bonds are constantly breaking and new ones are constantly forming, with
some molecules breaking off and others joining the cluster. An ice crystal, in contrast, has a more or
less stable arrangement of hydrogen bonds and its number of molecules is many orders of
magnitude greater than 100.
POINTS: 1
QUESTION TYPE: Essay
HAS VARIABLES: False
TOPICS: Hydrogen Bonds
DATE CREATED: 11/25/2016 5:46 AM
DATE MODIFIED:
11/25/2016 5:47 AM
89. Which of the following equations represents the relationship between the pK
a
of an acid and the pH of a solution
containing the acid and its conjugate base?
a.
Arrhenius equation
b.
Henderson–Hasselbalch equation
Chapter 01 - Biochemistry and the Organization of Cells
c.
Nernst equation
d.
Butler–Volmer equation
ANSWER: b
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Acids, Bases, and pH
DATE CREATED: 11/25/2016 5:48 AM
DATE MODIFIED:
11/25/2016 5:49 AM
90. Which of the following principles states that if stress is applied to a system in equilibrium, the equilibrium will
shift in the direction that relieves the stress?
a.
Pauli exclusion principle
b.
Mach’s principle
c.
Fermat’s principle
d.
Le Chatelier’s principle
ANSWER: d
POINTS: 1
QUESTION TYPE: Multiple Choice
HAS VARIABLES: False
TOPICS: Which of the following principles states that if stress is applied to a system in equilibrium,
the equilibrium will shift in the direction that relieves the stress?
DATE CREATED: 11/25/2016 5:50 AM
DATE MODIFIED:
11/25/2016 5:51 AM