Structure and Properties of Peptides
Peptides in the fully extended chain conformation

have Y = F = 180°
do not occur in nature
also have a cis geometry in their peptide bonds
are equivalent to the (3-sheet structure

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

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

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