Structure and Properties of Peptides
The peptide bond in proteins is

only found between proline residues
usually trans unless proline is the next amino acid
usually cis unless proline is the next amino acid
is planar because of steric hinderance

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

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