Choose the correct statement.

A. Peptides that are unstructured will have all the backbone dihedral angles in the disallowed regions. B. The sequence of a peptide should be known to deduce a Ramachandran plot. C. Glycine is found scattered among the four quadrants because its small side chain decrease the resonance stabilization of the peptide bond allowing more rotational freedom. D. The φ and ψ values of a β-strand composed of all D-amino acids will mainly occupy lower right quadrant in the Ramachandran plot. E. The allowed values of φ,ψ for amino acids in a protein are valid for short peptides also. F. A 20-residue peptide that is acetylated at the N-terminus and amidated at the C-terminus has φ = -60°(±5), ψ = -30°(±5) for all the residues. It can be concluded that conformation of the peptide is helix-turn-strand.
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