Structure and Properties of Peptides
The peptide bond in proteins is

only found between proline residues
is planar because of steric hinderance
usually cis unless proline is the next amino acid
usually trans unless proline is the next amino acid

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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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