Practice_Exam_III_US10

Practice_Exam_III_US10 - Practice Exam III Page 1 The next...

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Practice Exam III The next exam will consist of 15 multiple-choice, TRUE FALSE questions, 10 written questions and 2 written extra credit questions. Please note there are more questions than that here. The next two questions require the following terms: i) Oxidative reactions of the pentose phosphate pathway. ii) Glycolysis iii) Non-oxidative reactions of the pentose phosphate pathway iv) The TCA cycle and oxidative phosphorylation. v) Gluconeogenesis 1. In a cell that required a great deal of energy and fatty acid synthesis, which of the pathways, i-v, would be active in addition to fatty acid synthesis? a) i, ii, iv b) i ii, iii, iv c) i, iv, v d) iii, iv,v 2.Which pathways, i or iii, would be active in rapidly dividing cells, like tumor cells, which require nucleic acids for DNA synthesis? a) i b) iii c) Both i and iii 3.The committed step in the conversion of glucose-6-phosphate to ribose-5-phosphate is catalyzed by glucose-6-phosphate dehydrogenase. True False 4. The cofactor thiamine pyrophosphate serves what purpose? a) acyl transferase reactions, in which the TPP carbanion makes a nucleophilic attack on the acyl group to be transferred b) methylation and 1-carbon transfers c) mutase reactions, in which the cobalt metal is reduced during radical formation d) epimerization reactions in which the carbocation dissipates the negative charge forming in the transition state. 5. During ATP synthesis, a proton gradient is used to protonate an aspartate residue in the c-ring of Fo. True False 6. Glycogen is synthesized when: a) insulin levels are low b) glycogen phosphorylase is deactivated by dephosphorylation c) in response to the global effectors, epinephrine and glucagon d) None of the above 7. The oxidative portion of the pentose phosphate pathway produces 3, 4, 5, 6 and 7 carbon sugars. True False _____________________________________________________________________________ ___________________________ Page 1
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8. Ketone bodies are: a) derivatives of Acetyl CoA used for energy production in heart muscle and also are used in the brain when carbohydrates stores are low or glucose metabolism is impaired b) macromolecular assemblages of lipids and lipoproteins used for lipid transport in the blood c) carbonyl-rich molecules stored in the liver as an alternative to triglycerides when fatty acid anabolism is not fully functional d) specialized carbohydrate complexes that are accumulated in diabetics instead of glycogen 9. The pentose phosphate pathway is: a)
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