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

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

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

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Structure and Properties of Peptides
The Ramachandran Plot illustrates the fact that

the peptide bond is planar
the F & Y angles can assume approximately three different values
the F & Y angles can assume only a single value in a protein
the F & Y angles can assume any value in a peptide

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