200501M2 - CHEM 237 Midterm 2a 1 ANSWERS Note Exam 2b has...

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CHEM 237 Midterm 2a March 11, 2005 ANSWERS Note: Exam 2b has the same questions and answers, but the order of the choices is different. 1. Which statement about Hb is true ? 2. BPG has what effect on the affinity of Hb for O 2 ? a. BPG binds at the center of the Hb tetramer and increases the affinity of Hb for O 2 . b. BPG reduces the affinity of fetal Hb by binding to the fetal Hb tetramer more strongly than to adult Hb. c. the binding of BPG to Hb reduces the affinity of Hb for O 2 by shifting the O 2 binding curve toward the Y-axis. d. BPG reduces the affinity of Hb for O 2 by stabilizing the T-state of Hb. ANSWER: D. BPG binds to the T-state, thereby stabilizing that state. BPG does bind to the center of Hb, but it decreases the affinity; BPG binds more weakly to HbF than to HbA; BPG does reduce the affinity of Hb to O 2 , but the curve is shifted away from the Y-axis.
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