Which of the following statements about the structure of hemoglobin is incorrect?

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Hemoglobin contains only two polypeptide chainsIron exists in the ferrous (Fe2+) form within hemoglobinHemoglobin shares structural similarities with myoglobinFerrous ions are located within the porphyrin ring

Explanation

The incorrect statement is that hemoglobin has only two polypeptide chains. In reality, hemoglobin is composed of four polypeptide chains. The other statements are true: iron is in the ferrous state, hemoglobin is structurally similar to myoglobin, and ferrous ions reside within the porphyrin rings.