The polypeptide of myoglobin serves all of the following functions EXCEPT: A) protects the heme iron from oxidation. B) cradles the heme group. C) provides a pocket for O₂ to fit. D) keeps the heme iron in the ferric form. E) none of the above.

Question

Quizplus · Accepted Answer

Myoglobin's polypeptide structure is designed to protect the heme iron from oxidation, cradle the heme group, and provide a specific pocket for oxygen binding, but it does not keep the heme iron in the ferric (Fe3+) form. Instead, it maintains the iron in the ferrous (Fe2+) state, which is necessary for oxygen binding.

The Polypeptide of Myoglobin Serves All of the Following Functions