The points in the Ramachandran plot are derived by

A) counting the number of amino acids and placing points in allowed regions.
B) measuring the And Angles in an experimentally determined protein crystal structure.
C) placing each amino acid in regions commonly occupied by that amino acid.
D) experimentally measuring the optical rotation of polarized light.

Question

The points in the Ramachandran plot are derived by

A) counting the number of amino acids and placing points in allowed regions. 
B) measuring the And Angles in an experimentally determined protein crystal structure. 
C) placing each amino acid in regions commonly occupied by that amino acid. 
D) experimentally measuring the optical rotation of polarized light.

Quizplus · Accepted Answer

The Ramachandran plot is derived by measuring the phi and psi angles in an experimentally determined protein crystal structure. Amino acids have certain allowed regions of phi and psi angles in which they can exist without steric hindrance, and these regions are depicted on the Ramachandran plot. Therefore, choice B is the correct answer.

The Points in the Ramachandran Plot Are Derived by