The Dissociated Subunits of Hemoglobin Have a Much Higher Affinity

question 39

Multiple Choice

The dissociated subunits of hemoglobin have a much higher affinity for oxygen than the intact molecule. Which of the following is the most likely explanation?

• A) BPG can interact much more readily with the dissociated subunits.
• B) The iron atom moves out of the plane of the heme.
• C) The heme dissociates from the globin.
• D) The Bohr effect operates more effectively.
• E) The allosteric effects reducing oxygen affinity require the intact tetramer.

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