Exam 3 Winter 05 - (fi PrintN ame Bio310 l ntroductory...

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(fi Print Name Bio310: lntroductory Biochemistry Winter Term 2005 Exam 3 Write clearly. lt is wrong if we can't read it. For multiple choice: choose the best answer(s) for each problem Three Point Questions 1. Which of the following is true about oxidative phosphorylation? A. Protons are transferred from the rnitochondrial matrix to the intermembrane space, providing the driving force for ATP synthesis. B. The process is regulated by the ratio of ADP and Pi to ATP. C. 10 H' are pumped across the inner membrane for each electron transferred from NADH. D. A and B. E. A, B and C. 2. Which of the following is NOT an electron donor to a photosynthetic reaction center? A. Cytochrome c B. HzS C HzO D. NADPH E. Plastocyanin 3. Which one is the essential intermediate in the pathway from acetate to cholesterol? A. Acetyl CoA B. Malonyl CoA C. lsoprene D. Phosphatidic acid E. CDP-diacylglycerol 4. The synthesis of both glycerophospholipids and triacylglycerols involves which of the following? A. ADP-glycerol B. CDP-diacylglycerol. C. Phosphatidate phosphatase. D. Phosphatidic acid. E. Phosphoethanolamine. 5. Which of these statements about fatty acid and eicosanoid synthesis is false? A. An early step in the path to thromboxanes is blocked by ibuprofen. B. Thromboxanes are produced from arachidonate via the "cyclic" path. C. Animal fatty acid synthase is a complex containing 7 different enzymatic activities. D. Humans can synthesize
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6. Glucose-6-phosphate is an important precursor to multiple metabolic pathways' which of the following is not one of the fates of G-6-P? A. Used in the pentose Phosphate Pathway to produce Ribulose-S-phosphate B. Converted to glycogen when blood glucose levels are low C Oxidized to sti-mulale glycolysis, Kreb;s Cycle and oxidative phosphorylation when energy is needed. D. Catabolized to acetyl-CoA to be used for fatty acid synthesis E. none of the above are false 7. Diabetes mellitus is a disease that results in the body's inability to regulate blood glucose levels efficienily. The following biochemical/physiological characteristics are relatively common in diabetics excePt A. High levels of acetoacetate and B-hydroxybutyrate in certain tissues B. Ketosis c. High levels of fatty acid oxidation leading to lowering of blood pH D. High carboxylic aiid levels exceeding thL body's bicarb.onate buffering capacity E. lnability to import glucose from blood into cells potentially resulting in glucosuria 8. Which of the following is FALSE about the metabolic fates of Amino Acids: A. Can be usedio synthesize other nitrogenous molecules such as nucleic acids and hormones B. Can be used for energy via deamination and oxidation
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Exam 3 Winter 05 - (fi PrintN ame Bio310 l ntroductory...

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