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

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

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

the peptide bond is planar
the F & Y angles can assume any value in a peptide
the F & Y angles can assume approximately three different values
the F & Y angles can assume only a single value in a protein

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Structure and Properties of Peptides
Secondary structure in protein refers to

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
protein made up of more than one polypeptide chain

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