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Question

Naturally occurring amino acids have configuration:

A
D
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B
L
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C
either D or L
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D
neither D nor L
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Solution

The correct option is D either D or L
About 500 naturally occurring amino acids are known (though only 20 appear in the genetic code) and can be classified in many ways. These are all L-stereoisomers ("left-handed" isomers), although a few D-amino acids ("right-handed") occur in bacterial envelopes, as a neuromodulator (D-serine), and in some antibiotics.
985423_549307_ans_ac24a0301aa04b4faf41ea044871483c.PNG

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