Which of the following statements are (is) true for the phi φ and psi Ψ angles...
Which of the following statements are (is) true for the phi φ and psi Ψ angles of a peptide?
A. Angles have conformational constraints.
B. Angles can assume any value in a peptide.
C. The angles always have a value of 180°.
D. The value of the angle φ is greater than the angle Ψ.
E. All of the above.
F. A and D.
G. A, C, D.
Homework Answers
Option A
Option A is correct because phi and psi are angles between alpha C and N and alpha C and C respectively, and are restricted due to specific conformation of atoms around peptide Bond.
Option B and C are incorrect because these angles have a value in between -180° to 180° and most of the values are not allowed due to steric hindrance.
Option D is incorrect because the two angles can have any value in the given range, any one of them can be greater and anyone can be lower.
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