Which of the following is required as an indu | vedclass

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(B) The $lac$ operon is an inducible operon that regulates the metabolism of lactose in $E. coli$.In the absence of lactose,the repressor protein bind

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Lactose

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(B) The $lac$ operon is an inducible operon that regulates the metabolism of lactose in $E. coli$.In the absence of lactose,the repressor protein binds to the operator region,preventing $RNA$ polymerase from transcribing the structural genes.When lactose is present in the medium,it enters the cell and is converted into its isomer,allolactose,by a small amount of $\beta$-galactosidase enzyme.Allolactose acts as an inducer by binding to the repressor protein,which causes a conformational change in the repressor,rendering it unable to bind to the operator.This allows $RNA$ polymerase to transcribe the structural genes $(lacZ, lacY, lacA)$,thus expressing the operon.Therefore,lactose is the inducer for the $lac$ operon.

Which of the following is required as an inducer for the expression of the $lac$ operon?

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