A Ramachandran Plot illustrates acceptable phi (φ) and psi (ψ) angles for amino acids in a polypeptide. What is the primary factor that restricts these angles?     The relative abundance of proline. a   The degree of side chain (R-group) interactions. b   The relative amount of inter- and intra-strand hydrogen bonding. c   Solvent entropy (hydrophobic effect) d   Steric hindrance.

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