hemoglobin (left) myoglobin (right)
Which of the following statements about hemoglobin and myoglobin structure are true? Select the five true statements.
A. Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom.
B. Heme is composed of an organic protoporphyrin component and a metal atom.
C. Hemoglobin is a heterotetramer, whereas myoglobin is a monomer.
D. Molecular oxygen binds reversibly to Fe2+ in heme.
E. Each hemoglobin or myoglobin molecule can bind four oxygen molecules.
F. Each iron atom can form six coordination bonds: Two of these bonds are formed between iron and oxygen.
G. By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atom.
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