The lac operon consists of

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(B) The correct answer is $B$. The $lac$ operon (an inducible operon) in $E. coli$ consists of a promoter,an operator,a regulator gene ($i$ gene),and

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one regulatory gene and three structural genes

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(B) The correct answer is $B$. The $lac$ operon (an inducible operon) in $E. coli$ consists of a promoter,an operator,a regulator gene ($i$ gene),and three structural genes: $z, y,$ and $a$.These structural genes code for the enzymes $\beta$-galactosidase,$\beta$-galactoside permease,and $\beta$-galactoside transacetylase,respectively.The $i$ gene codes for a repressor protein that regulates the expression of these structural genes.In the presence of an inducer (allolactose),the repressor is inactivated,allowing $RNA$ polymerase to transcribe the structural genes.

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