Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 10, Problem 10.12PS
Brown Fat and Thermogenin. Most newborn mammals, including human infants, have a special type of adipose tissue called brown fat, in which a naturally occurring uncoupling protein called thermogenin is present in the inner mitochondrial membrane. Thermogenin uncouples ATP synthesis from electron transport so that the energy released during electron transport is lost as heat.
(a) What happens to the energy that is released as electron transport continues but ATP synthesis ceases? Why might it be advantageous for a baby to have thermogenin present in the inner membrane of the mitochondria that are present in brown fat tissue?
(b) Some adult mammals also have brown fat. Would you expect to find more brown fat tissue and more thermogenin in a hibernating bear or in a physically active bear? Explain your reasoning.
(c) Given its location in the cell, suggest a mode of action for thermogenin. What kind of an experiment can you suggest to test your hypothesis?
(d) What would happen to a mammal if all of its mitochondria were equipped with uncoupling protein, rather than just those in brown fat tissue?
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Chapter 10 Solutions
Becker's World of the Cell (9th Edition)
Ch. 10 - Aerobic respiration uses an external electron...Ch. 10 - Working with 3-D TEM often involves the difficult...Ch. 10 - Explain how the location and organization of the...Ch. 10 - As pyruvate is completely oxidized to CO2 in the...Ch. 10 - Why are the electron carriers in the ETS arranged...Ch. 10 - How is the chemical energy that is released as...Ch. 10 - How does the ATP synthase complex convert the...Ch. 10 - Where do the 38 ATP molecules produced during...Ch. 10 - Localization of Molecules and Functions Within the...Ch. 10 - Localization of Molecules and Functions Within the...
Ch. 10 - True or False. Indicate whether each of the...Ch. 10 - Mitochondrial Transport. For aerobic respiration,...Ch. 10 - Completing the Pathway. In each of the following...Ch. 10 - QUANTITATIVE The Calculating Cell Biologist. Use...Ch. 10 - Prob. 10.7PSCh. 10 - Regulation of Catabolism. Explain the advantage to...Ch. 10 - Lethal Synthesis. The leaves of Dichapetalum...Ch. 10 - QUANTITATIVE Oxidation of Saturated Fatty Acids....Ch. 10 - Oxidation of Cytosolic NADH. In some eukaryotic...Ch. 10 - Brown Fat and Thermogenin. Most newborn mammals,...Ch. 10 - Prob. 10.13PS
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