What structural feature distinguishes proline from other natural α-amino acids?
A
It is optically inactive
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B
It contains aromatic group
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C
It is a di carboxylic acid
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D
It has a secondary amine
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Solution
The correct option is D It has a secondary amine Proline consist of a secondary amine which makes it different from other natural α-amino acids. Its codons are CCU, CCC, CCA, and CCG. It is not an essential amino acid, which means that the human body can synthesize it.