Structure and Properties of Peptides
Hemoglobin has quaternary structure and is made up of

two polypeptide chains, one α-chains and one β-chains
five polypeptide chains, two α-chains and three β-chains
six polypeptide chains, two α-chains and four β-chains
four polypeptide chains, two α-chains and two β-chains

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Structure and Properties of Peptides
In deoxy hemoglobin (Hb), the Fe (II) is coordinated to

two nitrogens of heme and to three His residues in Hb
four nitrogens of heme and to a water molecule
four nitrogens of heme, the proximal His, and a water molecule
two nitrogens of heme and to three water molecules

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