exam3s06 - CH 369 Spring 2006 Exam 3 - Multiple Choice 1....

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CH 369 Spring 2006 Exam 3 - Multiple Choice 1. Saliva’s role in digestion includes the a) secretion of HCl. b) secretion of pepsin. c) secretion of amylases. d) secretion of bile salts. e) secretion of lipases. 2. During digestion, most materials enter the bloodstream from the a) liver b) small intestine c) stomach d) gall bladder e) large intestine 3. During digestion ______________ bonds are cleaved in neutral fats. a) ester b) amide c) glycosidic d) ether e) imide 4. How do standard conditions of G°' differ from those of G°? a) All concentrations are 1M. b) Pressure is 1 atm. c) Volume is 1 L. d) Temperature is 25°C. e) pH is 7. 5. Phosphoenol pyruvate is a(n) ____________________ of phosphofructokinase. a) allosteric inhibitor b) allosteric activator c) feedback inhibitor d) competitive inhibitor e) none of these
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6. Lactose has what type of glycosidic bond? a) β (1 6) b) α (1 6) c) β (1 4) d) α (1 4) e) none of these 7. The enzyme enolase catalyzes what type of reaction? a) rearrangement b) isomerization c) tautomerization d) dehydration e) redox 8. Lactate dehydrogenase requires __________ to catalyze the conversion of pyruvate to lactate. a) NAD + b) NADH c) FAD + d) FADH 2 e) ATP 9. What is the net yield of NADH in the conversion of one glucose molecule to two lactate molecules? a) zero b) one c) two d) three e) more than three 10. What cofactor of the pyruvate dehydrogenase complex directly transfers the 2-carbon acetyl group to coenzyme A? a) thiamine pyrophosphate b) NAD + c) lipoic acid d) FADH 2 e) none of these
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11. In the citric acid cycle succinate is converted to _____________ by succinate dehydrogenase. a) a-ketoglutarate b) malate c) isocitrate d) fumarate e) oxaloacetate 12. The purpose of Complex III in oxidative phosphorylation is to a) transfer electrons from ubiquinol to cytochrome c b) transfer electrons from NADH to ubiquinone. c) transfer electrons from ubiquinol to O 2 . d) transfer electrons from succinate to ubiquinone. e) transfer electrons from cytochrome c to O 2 . 13. Almost all of the oxygen consumed in breathing is converted to a) carbon monoxide and then carbon dioxide b) carbon dioxide c) water d) acetyl-CoA e) none of these 14. Uncoupling of mitochondrial oxidative phosphorylation a) allows continued mitochondrial ATP formation but halts O 2 consumption. b) halts all mitochondrial metabolism. c) halts mitochondrial ATP formation, but allows continued O 2 consumption. d) slows down the citric acid cycle. e) slows the conversion of glucose to pyruvate by glycolysis. 15. Assuming a continued input of glucose, which among the following intermediates of glycolysis will accumulate if phosphofructokinase is inhibited? a) Phosphoenolpyruvate
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exam3s06 - CH 369 Spring 2006 Exam 3 - Multiple Choice 1....

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