I have stumbled upon the following past exam question:
4 decapeptides A, B, C, D, made only of glycine residues, have different conformations, and the phi and psi angles of individual peptides are indicated on the Ramachandran plot (unfortunately I cannot provide a specific plot). Order these peptides by decreasing length.
How should I solve this, what information useful in solving this problem can I deduce from the Ramachandran plot?