human physiology study questions. 4 pdf

human physiology study questions. 4 pdf - B. 2 molecules of...

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1/30/08 Lecture 4 Study Questions 1. The rate of enzymatic reaction depends on: A. Activation energy required. B. Enzyme concentration. C. Substrate concentration. D. All of the above. 2. Which statement(s) is(are) INCORRECT? A. Oxidative phosphorylation takes place in the cytosol. B. Glycolysis takes place in the cytosol. C. The Krebs cycle occurs in the mitochondria. D. Glycolysis occurs in mitochondria. E. A and D are TRUE. 3. Which of the following is FALSE with respect to a rate-limiting reaction? A. It is the slowest reaction in a chain of reactions. B. It regulates the amount of end product formed C. Changing the concentration of enzymes and substrates in a cell can change which reaction is the rate limiting step in a metabolic pathway. D. It is typically an irreversible reaction. 4. The result of glycolysis of one molecule of glucose is: A. 1 molecule of pyruvate is synthesized.
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Unformatted text preview: B. 2 molecules of ATP and 2 NADH produced. C. 2 molecules of pyruvate are synthesized. D. A and B. E. B and C. 5. In gluconeogenesis: A. New molecules of glucose are synthesized B. Excess glucose can be stored in the liver in the from of glycogen. C. Many enzymes involved are the same as in glycolysis. D. All of the above. E. None of the above. Correct answers: 1. D. (p.75) 2. E. Oxidative phosphorylation and the Krebs cycle occur in the mitochondria, and glycolysis in the cytosol. 3. D. Rate-limiting reaction is the slowest reaction in a chain of reactions. Which reaction in a chain is the rate limiting one may change as more substrate or activated enzyme become available. Also changes in cellular pH might slow a reaction down and speed up another. Rate-limiting enzymes are often the sites of allosteric and covalent regulation. (p.75) 4. E. (p.78 and p. 80.) 5. D. (p. 86)...
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This note was uploaded on 07/01/2008 for the course INTEGRATIV 130 taught by Professor Kregel during the Spring '08 term at University of Iowa.

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