Short Answer
The structural formulas for the 20 naturally occurring amino acid residues are shown in the panel below. Answer the following question(s) with the help of this panel.
-Which of the amino acids shown above has the most limited combinations of phi (?) and psi (?) angles in its Ramachandran plot? Write down the one-letter abbreviation for it, e.g. A.
Correct Answer:

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Proline, being an imino acid,...View Answer
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