Under conditions where tryptophan is scarce:

Question

Quizplus · Accepted Answer

Under conditions where tryptophan is scarce, the ribosome stalls at the tryptophan codons on the leader sequence due to the lack of tryptophan. This stalling allows the formation of the preemptor stem-loop structure, which prevents the formation of the attenuator stem-loop that would terminate transcription. Thus, transcription of the trp operon continues, allowing the cell to potentially synthesize more tryptophan.

Under Conditions Where Tryptophan Is Scarce