User:Eric Martz/Ramachandran Principle Quiz

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1. How many bonded atoms are required to constitute a dihedral (torsion) angle, such as phi or psi?

None
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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) Cα in the amino acid containing the phi bond; and (4) the carboxy carbon of the amino acid containing the phi bond.

2. The number of phi and psi angles in an isolated amino acid (not in a polypeptide chain) is:

3
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8

3. The number of atoms held into a geometric plane by a peptide bond is:

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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.

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Eric Martz

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