Which of the following would you expect to fi | vedclass

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(A) In an inducible operon system,such as the $lac$ operon,the gene expression is normally 'off'.This is because a repressor protein is constitutively

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$A$ repressor protein,which is bound to $DNA$ in the absence of any other factor.

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(A) In an inducible operon system,such as the $lac$ operon,the gene expression is normally 'off'.This is because a repressor protein is constitutively synthesized and binds to the operator region of the $DNA$ in the absence of an inducer (the substrate).When the inducer is present,it binds to the repressor,causing a conformational change that prevents the repressor from binding to the $DNA$,thereby allowing transcription to proceed.Therefore,in the absence of any other factor (like an inducer),the repressor protein remains bound to the $DNA$.

Which of the following would you expect to find in an inducible system?

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