Structure and Properties of Peptides
The oxygen in hemoglobin and myoglobin is bound to

histidine residues in the protein
lysine residues in the protein
the iron atom in the heme group
the nitrogen atoms on the heme

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

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

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