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sampleexam2pt1 - BC 367 Exam 2 Name Part I Multiple...

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BC 367 Exam 2- November 17, 2005 Name____________________ Part I- Multiple Choice (36 points)- Choose the single most correct answer. 1. In hemoglobin, the transition from T state to R state (low to high affinity) is triggered by: __ A. binding of CO 2 . __ B. H + produced during metabolism. __ C. formation of specific ion pair interactions. __ D. increased levels of BPG. __ E. oxygen binding. 2. Which of the following is correct concerning oxygen binding to hemoglobin? __ A. Addition of the third O 2 is more difficult than addition of the second. __ B. The "Bore Effect" refers to the inhibition of oxygen delivery and subsequent drowsiness that ensues during long-winded lectures. __ C. The binding of O 2 changes the valence of the iron in heme. __ D. The binding of CO increases O 2 affinity. __ E. O 2 binds with reduced affinity to fetal hemoglobin relative to adult hemoglobin. 3. Compare the two reaction coordinate diagrams below and select the answer that correctly describes their relationship. In each case the single intermediate is the ES complex. __ A. 2 is at lower energy than 4 because 2 has decreased entropy relative to 4 . __ B. The activation energy for the catalyzed reaction is 5 in (a) and is 7 in (b). __ C. (a) describes a strict "lock and key" model whereas (b) describes a transition-state complementarity model.
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