Biochemistry
Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Chapter 17, Problem 8P

How Is Metabolism Regulated? (Integrates with Chapter 15.) Metabolic regulation is achieved via regulating enzyme activity in three prominent ways: allosteric regulation, covalent modification, and enzyme synthesis and degradation. Which of the.se three modes of regulation is likely to be the quickest; which the .slowest? For each of these general enzyme regulatory mechanisms, cite conditions in which cells might employ that mode in preference to either of the other two.

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Metabolic flux is regulated by both availability of substrates and level of enzyme activity. Match the mechanism by which enzyme activity is regulated (A, B, C) with a specific example of this type of regulation (1, 2, 3, 4, 5, 6). Each mechanism is associated with two specific examples. Mechanism of Regulation A. Catalytic activity B. Compartmentation C. Enzyme levels A:1,5; B:3,4; C:2,6 OA:1,5; B:3,6; C:2,4 A:2,5: B:3.4. C.16 Example of Regulation 1. covalent modification 4. subcellular localization 2. protein synthesis 5. allosteric control 3. tissue localization 6. gene transcription
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6. Reciprocal regulation of opposing pathways is necessary to avoid the wasteful synthesis anddegradation of metabolic intermediates. Provide two distinct examples of reciprocal regulation. Bespecific, and be sure to explain the conditions that signal enzyme activation and/or inhibition.
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