Each heme unit holds an iron ion in such a way that the iron can interact with a oxygen molecule, forming deoxyhemoglobin. Group of answer choices True False
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Hemoglobin is a protein composed of four heme units, each containing an iron ion (FeĀ²āŗ) at its center. Show moreā¦
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#4) when oxygen binds to heme-containing protein, the two open coordination bonds of Fe^2+ are occupied by one O2 molecule and one amino acid atom. true or false
Caryl A.
Which of the following statements is/are true of both hemoglobin and myoglobin? (a) Acidic conditions lower the affinity for oxygen (b) The iron atom of the heme prosthetic group is bound at five of its six coordination sites to nitrogen atoms. (c) O2 binding occurs in the cleft where the polypeptides come into contact. (d) None of the above is true of both molecules. 5. Indicate whether each of the following statements about the heme-binding site in myoglobin is true or false. If you think a statement is false, explain why. (a) The proximal histidine covalently binds iron (b) The distal histidine covalently binds oxygen (c) The distal histidine binds iron (d) Free heme binds CO with the Fe, C and O atoms in a linear array (e) The iron in heme binds the oxygen atom of CO
Josee P.
Which of the statements about hemoglobin and myoglobin structure are true? Each iron atom can form six coordination bonds, and one of these bonds is formed between iron and oxygen. Hemoglobin and myoglobin are heterotetramers. Each hemoglobin molecule can bind four oxygen molecules, and 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. Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron (Fe) atom. 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.
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