User:Eric Martz/Ramachandran Principle Quiz

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→	The phi angle is defined by (1) the carboxy carbon from the previous amino acid; (2) N in the amino acid containing the phi bond; (3) C_α in the amino acid containing the phi bond; and (4) the carboxy carbon of the amino acid containing the phi bond.

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→	The phi angle involves the carboxy carbon of the previous amino acid in a polypeptide chain. The psi angle involves the N of the subsequent amino acid. Therefore an isolated single amino acid has neither phi nor psi angles.