Myoglobin
A) binds O2 at PO2 values at which hemoglobin is releasing its bound O2.
B) has a lower affinity for O2 than hemoglobin does.
C) consists of four polypeptide chains, just as hemoglobin does.
D) provides an immediate source of O2 for muscle cells at the onset of activity.
E) can bind four O2 molecules at once.
Correct Answer:
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