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

not present at Phe residues
more numerous than Vander Waals interactions
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

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
three dimensional arrangement of all amino acids in polypeptide chain

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