Which of the following is correct regarding the regulation of tryptophan operon?
Correct answer: B. Transcription is terminated prematurely when tryptophan is absent
The regulation of the tryptophan operon occurs at the transcriptional level. Tryptophan acts as a repressor, binding to the repressor protein which then binds to the operator region preventing transcription. When tryptophan levels are low, the repressor is less effective, allowing transcription to proceed.