Which one of the following coenzymes is required for the conversion of L-alanine to a racemic mixture of D- and L-alanine?

Pyridoxal-

6

-phosphate

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Thiamine pyrophosphate

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Coenzyme A

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Flavin adenine dinucleotide

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Solution

The correct option is D Pyridoxal- $6$ -phosphate
Pyridoxal-6-phosphate is the active form of vitamin B $_{6}$ . It acts as coenzyme in many enzymatic reactions. One of the reaction in which it functions as coenzymes is the conversion of L-alanine to a recemic mixture of D- and L-alanine. This reaction is catalyzed by enzyme alanine racemase.
Thus, the correct answer is option A.

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