Identify the true statements regarding the heme group of myoglobin and hemoglobi

ID: 852546 • Letter: I

Question

Identify the true statements regarding the heme group of myoglobin and hemoglobin:

-The iron in the heme group can form six bonds: the fifth is with an imidazole ring of a histidine and the sixth is with oxygen.

-The globin chains of myoglobin and hemoglobin prevent the oxidation of Fe2+ to Fe3+, which irreversibly binds to oxygen.

-The cooperativity of oxygen binding in hemoglobin arises from electronic interactions between heme groups.

-The T-state of hemoglobin has lower affinity for O2 than the R state because the Fe-N(porphyrin) bonds are longer.

-Hemoglobin contains four heme groups.

-A heme group contains four pyrrole rings, which are linked via methene (methine) bridges.

-The heme group is conjugated.

dentify the true statements regarding the heme group of myoglobin and hemoglobin:

-The iron in the heme group can form six bonds: the fifth is with an imidazole ring of a histidine and the sixth is with oxygen.

-The globin chains of myoglobin and hemoglobin prevent the oxidation of Fe2+ to Fe3+, which irreversibly binds to oxygen.--------true

-The cooperativity of oxygen binding in hemoglobin arises from electronic interactions between heme groups.------true

-The T-state of hemoglobin has lower affinity for O2 than the R state because the Fe-N(porphyrin) bonds are longer..--------true

-Hemoglobin contains four heme groups.-----true

-A heme group contains four pyrrole rings, which are linked via methene (methine) bridges.-----true

-The heme group is conjugated.-----true

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