Which of the following statements about hemoglobin and myoglobin structure are t

ID: 500020 • Letter: W

Question

Which of the following statements about hemoglobin and myoglobin structure are true? Select the five true statements.

Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom.

Heme is composed of an organic protoporphyrin component and a metal atom.

Hemoglobin is a heterotetramer, whereas myoglobin is a monomer.

Molecular oxygen binds reversibly to Fe2+ in heme.

Each hemoglobin or myoglobin molecule can bind four oxygen molecules.

Each iron atom can form six coordination bonds: Two of these bonds are formed between iron and oxygen.

By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atom.

Correct answer :

1. Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom.

2. Heme is composed of an organic protoporphyrin component and a metal atom.

3. Hemoglobin is a heterotetramer, whereas myoglobin is a monomer.

4. Molecular oxygen binds reversibly to Fe2+ in heme.

5. 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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