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Tryptophan self-controls its synthesis. If we have a large amount of tryptophan in the sense that it exceeds, tryptophan would act as a co-repressor which prevents synthesis of more enzymes for its production. Hope this answers the question.

Answer: Tryptophan can act as promoter, co-repressor and repressor. This is how the tryptophan controls its own synthesis.

Explanation:

It depends on the amount of Tryptophan, present in the cell which decides its behavior.

  • If the amount of the Tryptophan present in the cell is less than normal then it binds to the repressor which starts the synthesis of the enzymes which is required for the production of the tryptophan.
  • If there an excess of Tryptophan in the cell then it acts as the promoter which prevents the synthesis of the enzyme required for the production of Tryptophan
  • It also acts as co repressor and stops the production of the enzyme required for the synthesis of Tryptophan.

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