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Microbiology, 2021

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326 8 • Review Questions<br />

18. Which of the following is not a commercially<br />

important fermentation product?<br />

A. ethanol<br />

B. pyruvate<br />

C. butanol<br />

D. penicillin<br />

19. Which of the following molecules is not<br />

produced during the breakdown of<br />

phospholipids?<br />

A. glucose<br />

B. glycerol<br />

C. acetyl groups<br />

D. fatty acids<br />

20. Caseinase is which type of enzyme?<br />

A. phospholipase<br />

B. lipase<br />

C. extracellular protease<br />

D. intracellular protease<br />

21. Which of the following is the first step in<br />

triglyceride degradation?<br />

A. removal of fatty acids<br />

B. β-oxidation<br />

C. breakage of fused rings<br />

D. formation of smaller peptides<br />

22. During the light-dependent reactions, which<br />

molecule loses an electron?<br />

A. a light-harvesting pigment molecule<br />

B. a reaction center pigment molecule<br />

C. NADPH<br />

D. 3-phosphoglycerate<br />

23. In prokaryotes, in which direction are hydrogen<br />

ions pumped by the electron transport system<br />

of photosynthetic membranes?<br />

A. to the outside of the plasma membrane<br />

B. to the inside (cytoplasm) of the cell<br />

C. to the stroma<br />

D. to the intermembrane space of the<br />

chloroplast<br />

24. Which of the following does not occur during<br />

cyclic photophosphorylation in cyanobacteria?<br />

A. electron transport through an ETS<br />

B. photosystem I use<br />

C. ATP synthesis<br />

D. NADPH formation<br />

25. Which of the following are two products of the<br />

light-dependent reactions?<br />

A. glucose and NADPH<br />

B. NADPH and ATP<br />

C. glyceraldehyde 3-phosphate and CO 2<br />

D. glucose and oxygen<br />

26. Which of the following is the group of archaea<br />

that can use CO 2 as their final electron acceptor<br />

during anaerobic respiration, producing CH 4 ?<br />

A. methylotrophs<br />

B. methanotrophs<br />

C. methanogens<br />

D. anoxygenic photosynthesizers<br />

27. Which of the following processes is not involved<br />

in the conversion of organic nitrogen to<br />

nitrogen gas?<br />

A. nitrogen fixation<br />

B. ammonification<br />

C. nitrification<br />

D. denitrification<br />

28. Which of the following processes produces<br />

hydrogen sulfide?<br />

A. anoxygenic photosynthesis<br />

B. oxygenic photosynthesis<br />

C. anaerobic respiration<br />

D. chemoautrophy<br />

29. The biogeochemical cycle of which of the<br />

following elements is based on changes in<br />

solubility rather than redox chemistry?<br />

A. carbon<br />

B. sulfur<br />

C. nitrogen<br />

D. phosphorus<br />

True/False<br />

30. Competitive inhibitors bind to allosteric sites.<br />

31. Glycolysis requires oxygen or another inorganic<br />

final electron acceptor to proceed.<br />

32. All organisms that use aerobic cellular<br />

respiration have cytochrome oxidase.<br />

33. Photosynthesis always results in the formation<br />

of oxygen.<br />

34. There are many naturally occurring microbes<br />

that have the ability to degrade several of the<br />

compounds found in oil.<br />

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