Micro Exam 2 Practice Exam Questions and Answers 2024

Micro Exam 2 Practice Exam Questions and Answers 2024 1. Fimbriae and pili differ in that pili: are used to transfer DNA 2. You are observing a cell through a microscope and note that it has no apparent nucleus. You conclude that is most likely:: has a peptidoglycan cell wall 3. Enzymes: -are made of proteins -increase the number of collisions in a chemical reaction -not used up in a reaction -lower activation energy of a rxn 4. Which is not a chemical component of a bacterial cell wall?: -cellulose 5. a patient suffering from an infection from gram-nagative bacillus is treated, but symptoms are worse. This is most likely due to: release of Lipid A from the cell wall of the destroyed bacteria 6. Structually, ATP is most like this type of molecule:: Nucleic acids 7. Gram-Positive cell walls:: -maintains shape of cell -senesitive to lysozyme -contains teichoic acids 8. A characteristic of Mycoplasma pneumoniae that makes it unique is that it: lacks a cell wall 9. Oxidizes organic compounds for energy and utilizes them for a carbon source:: chemoheterotroph 10. Uses sunlight for energy and CO2 for carbon: photoautotroph 11. Glycolysis converts one glucose molecule to: 2 pyruvic acid molecules 12. A strict (obligate) anaerobe produces:: NEITHER catalase nor superoxide dismutase 13. Saccharomyces cerevisiae, a yeast, is capable of fermentation and respi- ration. Which will produce most alcohol>: Grown in absence of oxygen 14. Metabolic pathways for the catabolism of lipid molecules include: Glycoly- sis AND Krebs cycle 15. The advantages of using solid media vs liquid broth for the isolation of pathogenic bacteria include: -isolation of organisms from mixed cultures -preliminary identification based on colony morphology 16. An organism that grows well at room temperature would be classified as a: Mesophile 17. Characteristics of lipids is that they: are a major source of energy for cells 18. T/F concerning fermentation: it produces lactic acid in animal cells: TRUE 19. Which has a thicker cell wall? Gram positive or Gram negative?: Gram Positive 20. Which best describes what happens when a bacterial cell is placed in a solution containing 10% NaCl?: Water will move out of the cell! 21. the best definition of osmotic pressure:: the active transport of a substance out of a cell to maintain equillibrium 22. By which mechanism can a cell transport a substance from a lower to higher concentration?: Active Transport 23. Which organelle most closely resembles a prokaryotic cell?: Mitochondria 24. Which is not a structure found in prokaryotic cells?: -Cilia 25. The difference between simple diffusion and facilitated diffusion is that facilitated:: -requires transporter proteins 26. What cell structure has a role in the initiation of disease?: Gram positive cell wall 27. Where are phospholipids most likely found in a prokaryotic cell?: plasma membrane 28. Where are phospholipids most likely found in a eukaryotic cell?: plasma membrane 29. Sterol-rich cell membranes are found in : Archaea 30. and are found in mycoplasmas: Pseudomurein and sterol-rich cell membranes 31. What will happen if a bacterial cell is placed in distilled water with lysozyme?: The cell will undergo osmotic lysis 32. A type of transport that is unique to prokaryotes and requires energy:: - group translocation 33. "eukaryotic organelles arose from prokaryotic cells living inside a host prokaryote" best explains:: Endosymbiotic Theory 34. The "9+2" arrangement of microtubules is seen in:: eukaryotic flagella 35. Functions of Glycoccalyx: -can protect bacterial cell from drying out -allows a bacterium to stick to surfaces -protects cell from phagocytosis 36. Which type of molecule contains -NH2 groups?: Proteins 37. How many molecules of ATP can be generated from the complete oxidation of glucose to CO2 and H20?: 38 38. Lactose + H2O --> glucose + galactose is a rxn: hydrolysis 39. According to the chemiosmotic mechanism, ATP is generated when: Pro- tons are moved across a membrane 40. Which is the best definition of oxidative phosphorylation: electrons are passed through a series of carriers to O2 41. What is NOT an end product of fermentation?: Glycerol 42. Whats the best definition of fermentation?: oxidation of glucose with organic molecules serving as electron acceptors