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)
has partial double bond character
is stronger than an ordinary single bond
is still not completely understood

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Structure and Properties of Peptides
Secondary structure in protein refers to

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

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