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

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

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

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