Structure and Properties of Peptides
The peptide bond in proteins is

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

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

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