Which molecule acts as a co-repressor to block transcription of the tryptophan operon?

Name: Which molecule acts as a co-repressor to block transcription of the tryptophan operon?
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Question

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Tryptophan acts as a co-repressor to block transcription of the tryptophan operon by binding to the repressor protein and causing a conformational change that allows it to bind to the operator region of the DNA, thereby blocking RNA polymerase from transcribing the genes involved in tryptophan biosynthesis.

Which Molecule Acts as a Co-Repressor to Block Transcription of the Tryptophan