User:Eric Martz/Ramachandran Principle Quiz

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{How many bonded atoms are required to constitute a
{How many bonded atoms are required to constitute a
[http://biomodel.uah.es/model5/prot/diedros_en.htm dihedral (torsion) angle], such as phi or psi?
[http://biomodel.uah.es/model5/prot/diedros_en.htm dihedral (torsion) angle], such as phi or psi?
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Revision as of 22:48, 23 June 2018

1. 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.

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

None
1
2
3
4
5
→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.

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

3
4
5
6
7
8

Questions below may have more than one correct answer.

4. Question

Correct answer.
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