Myoglobin

question 135

Multiple Choice

Myoglobin

• A) binds O₂ at P_O2 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.

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