BioChem 210 Module 4 Exam - Portage Learning

BioChem 210 Module 4 Exam - Portage Learning

1. Which of the following monosaccharides is a ketose?

Dihydroxyacetone 

Galactose 

Glucose 

Glyceraldehyde 

Idose:

2.  When two carbohydrates are epimers:

One is a pyranose, the other a furanose

One is an aldose, the other a ketose

They differ in length by one carbon

They differ only in the configuration about one carbon atom  They react differently with iodine: Lactose is made from linking galactose and glucose. When this happens, _____.

Gas is eliminated

An anomeric carbon is formed on carbon-1 

Water is released

An epimer is formed

An aldose is formed:

3.  Amylose and amylopectin are both polymers of:

A

)

±

-

D

-

g

l

u c o s

e

B

)

²

-

D

-

g

l

u c o s

e

C)  Galactose

D)  Idose

E)   Maltose: A.) alpha-D-glucose

6. Which statement about starch and glycogen is false?

A)  Both have ²-D-glucose monomers

B)  Both starch and glycogen are energy storage polysaccharides 

C)  Both are homopolymers of glucose

D)  Glycogen is more extensively branched than starch

E)   Both have O-glycosidic linkages: A.) both have beta-D-

Glucose monomers

7.      Which monosaccharide is not a six-carbon monosaccharide?

Fructose 

Ribose 

Mannose 

Galactose 

Glucose:

8.      The two monosaccharides shown below could best be described as:

Anomers 

Aldoses 

Ketoses 

Epimers 

Pentoses:

9.      Which arrow correctly identifies the atom that will become the anomeric carbon?:

10.  Based on the form of the cyclic sugar below in a Haworth projection, which Fischer projection formula could have formed this structure?:

11.  The following monosaccharides are covalently bonded.

What type of bond unites them?:

Which statement about cellulose is true?

Cellulose is the primary storage polysaccharide of animal cells

Cellulose is a highly branched polysaccharide

Cellulose is a homopolysaccharide

The glucose residues of cellulose contain the same configuration as the glucose residues of amylose

Cellulose     is     an     anomer     of    chitin: The polysaccharide cellulose is most chemically similar

to:

Glycogen 

Dextrose 

Glycogen 

Chitin 

Starch:

12.  Which of the following is the most common monosaccharide on earth? Ribose 

Cellulose 

Chitin 

Sucrose 

Glucose:

13.  The "D" in the D-carbohydrates stands for:

Derivation 

Double

 Disaccharide 

3-dimensional 

Dextrorotatory:

14.  Which compound does not fit the formal definition of a carbohydrate?

A

.

C

6

H

1

2

O

6

B

.

C

7

H

1

0

O

7

C.  C8H16O8

D.  C3H6O3

E.  C4H8O4:

17.       identify the hemiacetal bond:

18.       tell the difference between alpha beta and D and L configurations:

19. Table sugar is also known as:

Sucrose 

Dextrose 

Glucose 

Galactose 

Glycogen:

20. Amylopectin has ±1 ’ 6 branching about every________ residues. 1 to 10

8 to 12

10 to 30

24 to 30

No branching:

21.  What element besides C, H, and O is found in the chitin?

Br 

N 

P 

S

Cl: N

22.  Some carbohydrates form a(n)___________ structure, which resembles a structure in proteins.

A)  ±form 

B)  ²-turn

C)  ²eta-sheet

D)  D-configuration 

E)   ±-helix: E.)

23. The equilibrium between _________ structures is called mutarotation.

A)  Anomer and epimer 

B)  ±and   ²

C)  L and D

D)  Helix and beta sheet 

E)   None of the above: B.)

24.  Consider the functions of carbohydrates. Which of the following is not a function of these molecules?

Structure

Energy storage 

Enzyme structure 

Both A and B 

Both A and C:

25.  The word saccharide means ___________.

Sugar 

Carbohydrate 

Energy molecule 

Sucrose

Starch: sugar

26.  Table sugar dissolves easily in water. Given its structure, explain why this is.:

27.  A) In the above structure, how many monosaccharide units are furanoses and how many are pyranoses?

B)  What is the linkage between the monosaccharides?

C)  Is this a reducing sugar?:

28. A hiker is lost in the wilderness and without food. He runs across several beetles with hard chitin exoskeletons. Would he get nutrition in the form of glucose from eating these beetles? Explain.:

29. What is the difference between amylose and amylopectin?:

30. A) Which carbon in the following molecule determines if the molecule is D or L? Indicate the letter corresponding the correct carbon ("A", "B", etc.) and explain. B) Is this molecule D or L?