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

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

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
the peptide bond is planar

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