Structure and Properties of Peptides
The peptide bond in proteins is

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

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

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