 
			 
			MCQOPTIONS
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				| 1. | Anthranilate synthase, the first enzyme of tryptophan biosynthesis after the branch point shows feedback inhibition and repression due to | 
| A. | L-tryptophan | 
| B. | D-L-tryptophan hydantoin | 
| C. | L-serine | 
| D. | pyruvate | 
| Answer» B. D-L-tryptophan hydantoin | |