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Molecular composition of hemoglobin

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

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Hemoglobin is the molecule which is made of four polypeptide chains, each bound to an iron-including molecular group which is named as heme group. So the molecule holds four polypeptide chains and four heme groups.

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

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