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

Question

Which of the following statements about hemoglobin and myoglobin structure are true? Select all the true statements. Each iron atom can form six coordination bonds: One of these bonds is formed between iron and oxygen. The heme prosthetic group is located in a hydrophobic cleft in the protein, with propionate propanoate) groups exposed at the surface. Molecular oxygen binds irreversibly to Fe2+ in heme. Hemoglobin and myoglobin are heterotetramers. Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron (Fe) atom. Each hemoglobin molecule can bind four oxygen molecules, each myoglobin can bind only one oxygen molecule By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron.

Explanation / Answer

Each iron atom can form six coordination bonds: one of these bonds is formed between iron and oxygen. True The heme prosthetic group is located in a hydrophobic cleft in the protein with propionate groups exposed at the surface. True Molecular oxygen binds irreversibly to Fe2+ in heme. False Hemoglobin and myoglobin are heterotetramers. False Both hemoglobin and myoglobin contain a prosthetic group called heme , which contains a central iron (Fe) atom. True Each hemoglobin molecule can bind four oxygen molecules, each myoglobin can bind only one oxygen molecule. True By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron. True

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