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Write the molecular composition of hemoglobin

Write the molecular composition of hemoglobin? Does the functionality of hemoglobin as a protein depend on its tertiary or on its quaternary structure?

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Hemoglobin is a molecule made up of four polypeptide chains, each bound to an iron-containing molecular group termed as a heme group. Therefore the molecule consists of four polypeptide chains and four heme groups.

Since a protein comprised of association of polypeptide chains, the functionality of hemoglobin depends on the integrity of its quaternary structure.

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