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Eduncle posted an MCQ
December 27, 2019 • 22:28 pm 0 points
  • CSIR NET
  • Life Sciences

Transcriptional regulation of trp operon by tryptophan involves binding of tryptophan to

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    Eduncle Best Answer

    When tryptophan is present, these tryptophan repressor dimers bind to tryptophan, causing a change in the repressor conformation, allowing the repressor to bind to the operator. This prevents RNA polymerase from binding to and transcribing the operon, so tryptophan is not produced from its precursor. When tryptophan is not present, the repressor is in its inactive conformation and cannot bind the operator region, so transcription is not inhibited by the repressor.

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