Which feature characterizes hemoglobin?
A) It is a lead-containing molecule in the red blood cells of vertebrates that transports O2.
B) It can bind up to six O2 molecules.
C) It consists of two polypeptide subunits.
D) Its capacity for transporting O2 is slightly less than that of plasma.
E) It binds carbon monoxide (CO) much more readily than it binds O2.
Correct Answer:
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