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

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

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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
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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