Structure and Properties of Peptides
Hydrogen bonds in a-helices are

more numerous than Vander Waals interactions
not present at Phe residues
analogous to the steps in a spiral staircase
roughly parallel to the helix axis

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Structure and Properties of Peptides
Secondary structure in protein refers to

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

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