Biochem Exam 3 Answers - 99:110 Exam 3 Test Form A April 6...

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99:110 Exam 3 Test Form A April 6, 2007 1. (one point) Citric acid cycle intermediates are replenished through a) amphibolic reactions b) catabolic reactions c) anabolic reactions d) anaplerotic reactions e) none of the above 2. Succinate dehydrogenase a. contains FAD and NAD+ cofactors like pyruvate dehydrogenase. b. Is an integral membrane protein unlike the other enzymes of the CAC. c. Carries out an oxidative decarboxylation like isocitrate dehydrogenase. d. All of the above. 3. Pyruvate carboxylase a. Catalyzes an irreversible carboxylation to form oxaloacetate. b. Requires ATP c. Is found in the cytoplasm of eukaryotic cells. d. a and b e. a, b, and c 4. Substrate-level phosphorylation occurs in which of the following metabolic pathways? a) β oxidation b) ketogenesis c) citric acid cycle d) urea cycle e) all of the above f) 5. Mammals can make sugar precursors from fats using a) gluconeogenesis b) pyruvate dehydrogenase complex c) citric acid cycle d) all of the above e) none of the above 6. The citric acid cycle a) has 2 irreversible steps b) is driven by decarboxylation c) produces NADPH for oxidative phosphorylation d) is regulated by feedback inhibition e) f) g) all of the above 7. Carbons that enter the citric acid cycle from acetyl CoA leave the cycle as a) carbon dioxide b) citric acid c) acetic acid d) malate for heme synthesis e) none of the above 8. Which of the following statements about the enzyme complexes of the electron-transport system are CORRECT? a. They are located in the mitochondrial matrix in large, multi-enzyme complexes. b. They cannot be isolated from one another in functional form. c. They are integral membrane proteins located in the inner mitochondrial membrane. d. None of the above. 9. Uncouplers, such as dinitrophenol (DNP) or thermogenin, uncouple electron transport and phosphorylation by a. Inhibiting cytochrome reductase. b.
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Biochem Exam 3 Answers - 99:110 Exam 3 Test Form A April 6...

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