Question

In the lac operon, allolactose acts as an inducer by - binding to the promoter keeping...

In the lac operon, allolactose acts as an inducer by

- binding to the promoter

keeping the repressor off of the operator sequence

- removing the repressor from the silencer sequence

- acting as a corepressor

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Answer #1

Answer :
Option - keeping the repressor off of the operator sequence

The repressor binds to the operator region of the lac operon and prevents RNA polymerase from transcribing the operon in the absence of inducer (Allolactose).
However, when present, allolactose binds to the repressor and forms an inducer-repressor complex. This complex cannot bind to the operator region and the lac operon is switched on. The free operator region now allows transcription and translation to take place.

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