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For each of the 20 common amino acids, indicate which region(s) of a Ramachandran plot they...

For each of the 20 common amino acids, indicate which region(s) of a Ramachandran plot they are most likely to populate (your answers should include phi and psi ranges)
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Answer #1

The Ramachandran's graph plot the allowed angles:

You see the bond can rotate and the bond can rotate too. The peptide bond can't rotate because there is a partial double bond. Now, rotation depends on the alkyl group R1.

Except for glysine and proline, the most likely region populated is the parallel beta sheet.

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