Choose the statement that correctly describes this equation:Hb + O2 ? HbO2
A. The O2 indicates that hemoglobin can bind up to two oxygen molecules.
B. Hb stands for mercury, an element that can interfere with the transport of oxygen in the blood.
C. Because of hemoglobin's high affinity for oxygen, when oxygen is present the equation is always in the bound state, on the right of the arrows.
D. The double arrow indicates that the binding is reversible.
Answer: D
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