Exam3-07 - CH369 Exam 3 Fall 2007 - Multiple Choice 1. The...

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CH369 Exam 3 Fall 2007 - Multiple Choice 1. The pancreas secretes which of the following enzymes? a. amylase b. pepsin c. lipase d. trypsin e. all of the above (except pepsin) 2. Bile salts are secreted by the a. salivary glands b. stomach c. pancrease d. gall bladder e. small intestine 3. Bonds in fats, proteins and carbohydrates are all split via _______________ reactions. a. dehydration b. hydrolysis c. oxidation-reduction d. phosphorolysis e. None of these - each is broken by a different reaction mechanism. 4. In glycogen, branch points are attached to which carbon atom of a glucose residue in the main chain? a. 1 b. 2 c. 3 d. 4 e. 6 5. In glycolysis, the net ATP input from the conversion of glucose to fructose-1,6- bisphosphate is a. 1 b. 2 c. 3 d. 4 e. 5 6. If a molecule of glucose is fully metabolized via anaerobic glycolysis in muscle, the end product is a. pyruvate b. ethanol c. CO 2 d. lactate e. acetyl CoA
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7. Phosphoenolpyruvate is an example of what kind of inhibitor to phosphofructokinase? a. competitive b. noncompetitive c. mixed d. feedback e. allosteric 8. The following diagram indicates the catabolism of pyruvate through the citric acid cycle. At which of the indicated steps is carbon dioxide produced? α -ketoglutarate oxalosuccinate succinyl-CoA isocitrate succinate cis-aconitase fumarate citrate malate oxaloacetate acetyl-CoA pyruvate a. b. c. d. e. 9. Glucose-1-phosphate is converted to fructose-6-phosphate in two sequential reactions: Glucose-1-phosphate Glucose-6-phosphate G o = 1.7 kcal/mole Glucose-6-phosphate Fructose-6-phosphate G o = -4.0 kcal/mole What is the G o for the overall reaction? a. 5.7 kcal/mole b. -2.3 kcal/mole c. -1.7 kcal/mole d. 2.3 kcal/mole e. -5.7 kcal/mole 6 7 5 8 4 9 3 10 2 11 1
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10. The most important control point in the glycolytic sequence from glucose to lactate occurs at the step where a. glucose is phosphorylated to form glucose-6-phosphate. b. fructose-6-phosphate is phosphorylated to from fructose-1,6-bisphosphate. c. fructose-1,6-bisphosphate is cleaved to form glyceraldehydes-3-phosphate and dihydroxyacetone phosphate. d. isocitrate is converted to a-ketoglutarate. e. 2-phosphoglycerate is converted to phosphoenol pyruvate. 11. What essential cofactor is produced in the pentose phosphate pathway? a. NAD + b. NADH c. ATP d. NADP + e. NADPH 12. Which cofactor in the pyruvate dehydrogenase complex is directly responsible for cleaving CO 2 from pyruvate? a. NAD+ b. FAD c. lipoic acid d. thiamine pyrophosphate e. biotin 13. ADP is an activator of which enzyme in the TCA cycle? a. aconitase b. succinyl-CoA synthetase c. isocitrate dehydrogenase d. malate dehydrogenase e. fumarase 14. Given the standard reduction potentials of the following two reactions, which of the compounds would be most likely to accept electrons and become reduced based on the values? SO
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Exam3-07 - CH369 Exam 3 Fall 2007 - Multiple Choice 1. The...

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