Problem: 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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Structures:


       


hemoglobin  (left)                                                                myoglobin (right)

  • protoporphyrin → porphyrin whose iron complex with protein occurs in hemoglobin and myoglobin
  • heme → iron-containing compound (porphyrin) which forms the nonprotein part of hemoglobin
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Problem Details

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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