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

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