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14 what is the final electron acceptor in the

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14. What is the final electron acceptor in the electron transport chain?
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AP BIOLOGY 3 15. Why does the electron transport chain produce less energy if FADH 2 is used as an electron shuttle rather than NADH? 16. Cyanide blocks the fourth complex of the electron transport chain. Suggest a hypothesis for what happens to the electron transport chain when the fourth complex stops working. (Hint – think about what would happen “downstream” of that complex). Your hypothesis should explain why cyanide poisoning is fatal. 17. Explain how different active and passive transport across the inner membrane of the mitochondria are essential to the production of ATP in cell respiration. 18. Diagram the relationship among the three components of cellular respiration: glycolysis, the Krebs cycle, and electron transport. What molecules connect these three processes? Where does each process occur in the cell? 19. How much ATP is made available to the cell from a single glucose molecule by the operation of (a) glycolysis, (b) the formation of acetyl CoA, (c) the Krebs cycle, and (d) the electron transport chain and chemiosmosis? 20. Compare cell respiration and fermentation in terms of where glucose is converted to pyruvate, which oxidizing agent is used, what the final electron acceptor is and approximately how many ATP are made. Why does cell respiration produce so much more ATP than fermentation does? 21. How do other carbohydrates, proteins and fats enter cell respiration? 22. What cell respiration intermediates are used to build the macromolecules? 23. Explain how feedback inhibition works. 24. Explain how phosphofructokinase regulates cell respiration. Chapter 40: 25. Put the following in order from smallest to largest: atom, cell, macromolecule, molecule, organ, organ system, organism, tissue. 26. What factors influence metabolic rate and how? 27. Why is it important for an organism to maintain homeostasis? 28. How do negative feedback work in terms of maintaining homeostasis? 29. Describe 4 adaptations for thermoregulation 30. How is epithelial tissue involved in thermoregulation? 31. Many people claim that drinking alcohol will keep your warm in the winter. How do their red noses indicate that this is simply a myth? 32. How does cell respiration relate to thermoregulation? Include a discussion of nonshivering theromogenesis and brown fat in your response. 33. A mammal eats about 10 times as much food as a lizard of the same size. Explain this difference. 34. Mammals that live in very cold environments are usually larger than members of the same species that live in warmer climates. Propose a functional explanation for this. 35. The metabolic rates of two groups of sheep were measured as the amount of oxygen consumed per hour. The group of sheep that was sheared before the experiment had a metabolic rate of 82L O 2 /g body weight. The group of unshorn sheep had a metabolic rate of 23 L O 2 /g body weight. Propose an explanation for these findings. How do these results support the theory that hair is an evolutionary advantage for endotherms?
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