User:Eric Martz/Ramachandran Principle Quiz

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1. The number of phi and psi bonds in each amino acid in a polypeptide chain is:

None
1
2
3
4
5
→The phi bond is between N and Cα. The psi bond is between Cα and the carbonyl carbon.

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

None
1
2
3
4
5
→
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.

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

None
1
2
3
4
5

4. Question

Correct answer.
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Eric Martz

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