Structure and Properties of Peptides
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

has partial double bond character
is still not completely understood
both (a) and (b)
is stronger than an ordinary single bond

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

two polypeptide chains, one α-chains and one β-chains
four polypeptide chains, two α-chains and two β-chains
six polypeptide chains, two α-chains and four β-chains
five polypeptide chains, two α-chains and three 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 water molecules
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 His residues in Hb

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