Biology · Biochemistry
The Ramachandran plot graphically shows which combinations of torsional angles phi (φ) and psi (ψ) of amino acid residues contained in a peptide are possible. Why are all the theoretical combinations of φ and ψ not possible?
- 1Two atoms cannot occupy the same space due to steric hindrance.✓
- 2The geometry of the peptide bond that links two amino acid residues restricts φ and ψ angles.
- 3Beta sheets and alpha helices determine the allowed regions of conformational space.
- 4The tertiary fold of polypeptides restricts conformational space.
Correct answer
Two atoms cannot occupy the same space due to steric hindrance.
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