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Chapter 19 Testbank - Chapter 19 Oxidative Phosphorylation...

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Chapter 19 Oxidative Phosphorylation and Photophosphorylation Multiple Choice Questions i. Electron-transfer reactions in mitochondria Page: 707 Difficulty: 1 Ans: E Almost all of the oxygen (O 2 ) one consumes in breathing is converted to: A) acetyl-CoA. B) carbon dioxide (CO 2 ). C) carbon monoxide and then to carbon dioxide. D) none of the above. E) water. 2. Electron-transfer reactions in mitochondria Pages: 710-713 Difficulty: 3 A new compound isolated from mitochondria is claimed to represent a previously unrecognized carrier in the electron transfer chain. It is given the name coenzyme Z. Which line of evidence do you feel is the least conclusive in assigning this compound a position in the electron transfer chain? 3. Electron-transfer reactions in mitochondria Pages: 712-713 Difficulty: 2 Antimycin A blocks electron transfer between cytochromes b and c 1 . If intact mitochondria were incubated with antimycin A, excess NADH, and an adequate supply of O 2 , which of the following would be found in the oxidized state?
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Chapter 19 Oxidative Phosphorylation and Photophosphorylation 4. Electron-transfer reactions in mitochondria Page: 714 Difficulty: 2 Cyanide, oligomycin, and 2,4-dinitrophenol (DNP) are inhibitors of mitochondrial aerobic phosphorylation. Which of the following statements correctly describes the mode of action of the three inhibitors?
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