Which statement below correctly states the function of hemoglobin as it reaches

Question

Which statement below correctly states the function of hemoglobin as it reaches the blood vessels in the muscle? A) protons bind to beta His-146 of hemoglobin, decreasing its affinity for 2, 3-BPG. B) CO_2 reacts with the alpha amino groups of hemoglobin, increasing its affinity for oxygen. C) protons bind to beta His-146 of hemoglobin, increasing its affinity for oxygen. D) 2, 3-BPG binds to the R form of hemoglobin, increasing its affinity for oxygen. E) CO_2 reacts with the alpha amino groups of hemoglobin, decreasing its affinity for oxygen. The myoglobin of a newly discovered whale consists of a single subunit that binds one molecule of O_2. At the muscle where the O_2 pressure is pO_2 = 20 torr, the saturation factor y = [MbO_2]/([Mb] + [MbO_2]) = 0.30. What is the value of the constant p50, the oxygen pressure at which y = 0.5? A) 47 B) 57 C) 67 D) 80 E) 87

Explanation / Answer

1.D. 2,3-BPG binds to the R form of hemoglobin, increasing it's affinity for oxgyen. without 2,3-BPG hemoglobin would be insufficient transporter of oxgyen.

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