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)
is still not completely understood
has partial double bond character

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

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
the F & Y angles can assume approximately three different values

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Structure and Properties of Peptides
Secondary structure in protein refers to

three dimensional arrangement of all amino acids in polypeptide chain
linear sequence of amino acids joined together by peptide bond
protein made up of more than one polypeptide chain
regular folding of regions of the polypeptide chain

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