Practice Exam

Topics: Cellular respiration, Adenosine triphosphate, Metabolism Pages: 10 (1313 words) Published: October 30, 2011
Practice Exam Ch 8
1. When glucose is broken down by glycolysis during bacterial fermentation, how many ATP are generated? A. 2 ATP
B. 3 ATP
C. 24 ATP
D. 36 ATP
E. 38 ATP
2. All of the following are exoenzymes except
A. ATP synthase.
B. streptokinase.
C. penicillinase.
D. collagenase.
E. elastase.
3. All of the chemical reactions of the cell are called
A. catabolism.
B. redox reactions.
C. phosphorylation.
D. metabolism.
E. cellular respiration.
4. The breakdown of peptidoglycan to N-acetylmuramic acid, N-acetylglucosamine and peptides is an example of A. anabolism.
B. catabolism.
C. phosphorylation.
D. fermentation.
E. biosynthesis.
5. Enzymes are
A. broken down in reactions that require energy input.
B. proteins that function as catalysts.
C. electron carrier molecules.
D. not needed for catabolic reactions.
E. All of the choices are correct.
6. Formation of peptide bonds between amino acids to build a polypeptide would be called A. anabolism.
B. phosphorylation.
C. fermentation.
D. exergonic.
E. glycolysis.

7. A holoenzyme is a combination of a protein and one or more substances called A. substrates.
B. apoenzymes.
C. catalysts.
D. cofactors.
E. None of the choices are correct.
8. Important components of coenzymes are
A. vitamins.
B. metallic ions.
C. active sites.
D. substrates.
E. ribozymes.
9. Enzymes that catalyze removing electrons from one substrate and adding electrons to another are called A. phosphotransferases.
B. oxidoreductases.
C. decarboxylases.
D. aminotransferases.
E. ligases.
10. When enzyme action stops due to a buildup of end product this control is called A. negative feedback.
B. competitive inhibition.
C. enzyme induction.
D. enzyme repression.
E. None of the choices are correct.
11. Exergonic reactions
A. include synthesis of large carbohydrates.
B. only occur in heterotrophs.
C. occur during aerobic cellular respiration.
D. do not occur in anaerobic cellular respiration.
E. occur when ADP binds to inorganic phosphate to form ATP. 12. In the cell, energy released by electrons is often used to phosphorylate A. ATP.
C. pyruvic acid.
D. oxygen.
13. All of the following pertain to glycolysis except it
A. occurs without oxygen.
B. ends with formation of pyruvic acid.
C. occurs during fermentation.
D. degrades glucose to CO2 and H2O.
E. involves reduction of NAD.

14. The formation of citric acid from oxaloacetic acid and an acetyl group begins A. glycolysis.
B. electron transport system.
C. Krebs cycle.
D. fermentation.
E. oxidative phosphorylation.
15. The step involving ATP, hexokinase, and the phosphorylation of glucose to glucose-6-phosphate is A. the final step of the Krebs cycle.
B. the first redox reaction of the electron transport system. C. an example of oxidative phosphorylation.
D. an example of substrate-level phosphorylation.
E. an example of photophosphorylation.
16. During aerobic cellular respiration, the final electron acceptor is A. pyruvic acid.
B. oxygen.
C. nitrate.
D. cytochrome c.
17. Which of the following is NOT involved in the step that occurs between glycolysis and the TCA cycle? A. reduction of NAD
B. decarboxylation of pyruvic acid
C. coenzyme A attaches to an acetyl group
D. dehydrogenation of pyruvic acid
E. pyruvic acid accepts electrons from NADH
18. In bacterial cells, the electron transport system is located in the A. cell membrane.
B. mitochondria.
C. chloroplasts.
D. ribosomes.
E. cytoplasm.
19. In which pathway is the most NADH generated?
A. electron transport system
B. Krebs cycle
C. glycolysis
D. alcoholic fermentation
E. mixed acid fermentation
20. The reactions of fermentation function to produce _____ molecules for use in glycolysis. A. pyruvic acid
E. glucose

21. During which of the phases of cellular respiration is the majority of ATP formed? A. electron transport
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