The expression of the tryptophan operon is controlled by

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The tryptophan operon is regulated by a repressor protein that is active when it binds to tryptophan. When tryptophan levels are high, tryptophan molecules bind to the repressor protein, causing a conformational change that allows it to bind to the operator region of the operon. This blocks RNA polymerase from transcribing the genes, effectively turning off the operon. When tryptophan levels are low, there is no tryptophan available to bind to the repressor, so the repressor cannot bind to the operator region, and RNA polymerase can transcribe the genes, turning on the operon.

The Expression of the Tryptophan Operon Is Controlled by