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Which of the following acts as a co-repressor in tryptophan operon?

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Which of the following acts as a co-repressor in tryptophan operon?

(a) tryptophan

(b) tyrosine

(c) glucose

(d) lactose

This question was addressed to me in an interview for internship.

My question comes from Gene Expression Control in chapter Control of Gene Expression of Cell Biology

1 Answer

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Best answer
Right choice is (a) tryptophan

Explanation: Unlike lactose operon which is an inducible operon, the tryptophan operon is a repressible operon. Presence of tryptophan prevents the transcription of synthesis machinery requisite for the production of tryptophan by the cell. Tryptophan in this case is therefore a co-repressor.

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