201_H9 - Jessica Richards-Elliott Biology 201-011 HW 9 1....

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Jessica Richards-Elliott Biology 201-011 HW 9 1. (A) Why does FADH-2 enter the electron transport chain at complex II, instead of complex I, which is where NADH enters. Your answer should reference the different amount of energy in FADH-2 & NADH, and why it would be impossible for Complex I to oxidize FADH-2. (B) List the following molecules in order, in terms of the affinity with which they attract electrons, starting with the molecule that has the lowest affinity for electrons & ending with the molecule having the highest affinity. Complex I Complex II Co Enzyme Q Complex IV Oxygen FADH-2 NADH 2. In step 6 of the citric acid cycle, succinate is converted to fumarate. The reaction is coupled to the conversion of FAD to FADH-2. Would succinate or fumarate have more carbon-hydrogen bonds? Is succinate being oxidized or reduced? Why is FAD being used here instead of NAD? 3. Aliens land at UNM. You find that in almost all ways, their metabolism is identical to that of humans.
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This note was uploaded on 11/26/2011 for the course BIO 201 taught by Professor Hofkin during the Fall '06 term at New Mexico.

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201_H9 - Jessica Richards-Elliott Biology 201-011 HW 9 1....

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