A Ramachandran Plot Shows

Multiple Choice

A Ramachandran plot shows:

A) the amino acid residues which have the greatest degree of rotational freedom.
B) the sterically allowed rotational angles between R groups and α-carbons in a peptide.
C) the sterically allowed rotational angles between Cα and the amide nitrogen (C_α−N) as well as between Cα and the amide carbonyl carbon (C_α−CO) .
D) the sterically allowed rotational angles about the amide nitrogen (NH) and CO.
E) the amino acid residues that form α-helix, β-sheet, etc.