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Which of the following statements about hemoglobin and myoglobin structure are true? Select the five true statements.
1. By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron.
2. Molecular oxygen binds irreversibly to the Fe(II) atom in heme.
3. Heme is composed of an organic protoporphyrin component and a metal atom.
4. Each hemoglobin molecule can bind four oxygen molecules; each myoglobin can bind only one oxygen molecule.
5. Hemoglobin and myoglobin are heterotetramers.
6. Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom.
7. Each iron atom can form six coordination bonds: One of these bonds is formed between iron and oxygen.
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