What is the molecular composition of hemoglobin, Biology

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What is the molecular composition of hemoglobin? Does the functionality of hemoglobin as a protein depend upon its tertiary or upon its quaternary structure?

Hemoglobin is a molecule made of four polypeptide chains, each bound to an iron-containing molecular group known as a heme group. So the molecule contains four polypeptide chains and four heme groups.

As a protein composed of association of polypeptide chains, the functionality of hemoglobin depends upon the integrity of its quaternary structure.

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