試題詳解

16. 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 alpha-carbons in a peptide,
(C) the sterically allowed rotational angles about the amide nitrogen (NH) and CO,
(D) the amino acid residues that form alpha-helix, beta-sheet,
(E) none of the above.