exam1_key_w08 - Name ID Version A Exam 1 Bis2A Winter 2008...

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Name ______________________________________ ID _________________________ Version A, Exam 1, Bis2A Winter 2008. Part 1: The correct answer is in bold type. 1. Bacteria are known that can grow by fermentation or anaerobic respiration or aerobic respiration or photosynthesis. Which condition below would be appropriate for anaerobic respiration ? A. The presence of oxygen. B. The absence of oxygen but the presence of a decent electron acceptor. C. Presence of a good fuel substrate (oxidizable compound) that supports growth. D. The presence of bright light. E. Both B and C above 2. Why can’t life synthesize new molecules from existing fuel sources indefinitely? A. Energy is conserved B. During energy transformations, some energy is lost as heat C. The first law of metabolism D. It can -- this is how life has made stuff for 2 billion years! E. None of the choices are correct 3. How do cells that use fermentation make their ATP? A. by running ATPase backwards B. from a proton-motive force C. by substrate-linked phosphorylation D. both A and C could be used E. All the choices are correct 4. What is the primary difference between nonoxygenic and oxygenic photosynthesis? A. The source of energy used by the cell B. The way of making ATP C. The way of making sugars D. The electron source E. All of the choices are correct 5. What do you (as a human and a respiring heterotroph) use as an electron donor? A. NADH B. H 2 O C. Degradable fuel compounds in food. D. Electron transport chain E. Proton motive force 6. Continuing with your metabolism as a respiring heterotroph, what do you use as the proximal electron acceptor (first in the process of oxidation) during fuel metabolism? A. Oxygen B. ATP C. NAD+ D. NADP+ E. CO 2
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7. What do you use as ultimate electron acceptor (again, as a respiring heterotroph) while sleeping soundly? A. NAD+ B. H 2 O C. Pyruvate D. Oxygen E. Sulfide in the diet. 8. What is the advantage of the noncyclic photosynthetic pathway over the cyclic photosynthetic pathway alone (that is, why bother)? A. The ability to make more ATP B. The ability to make a proton-motive force C. The ability to make oxygen D. The ability to oxidize non-organic electron sources E. The ability to harvest high energy electrons 9. What would be the affect if the membrane spanned by the electron-transport chain were leaky to protons? A. The cell would make less ATP B. The cell would generate more heat C. The cell would burn fuels more quickly D. Both B and C are correct E. All the choices are correct 10. When Pasteur disproved Spontaneous Generation – the idea that full-blown cells could arise from a wide variety of inorganic starting materials on today’s earth -- biologists came to believe in vitalism, that is, that only living things could make organic molecules. The disproof of vitalism A. was an experimental protocol that made organic molecules from simple
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exam1_key_w08 - Name ID Version A Exam 1 Bis2A Winter 2008...

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