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.

Similar Questions

In an $E. coli$ strain,the $i$ gene gets mutated such that its product cannot bind the inducer molecule. If the growth medium is provided with lactose,what will be the outcome?

In the Operon concept,the regulator gene functions as:

In the lactose operon of $Escherichia \text{ } coli$, what is the function of the promoter?

The regulation of the $lac$ operon by a repressor is known as:

What are promoter,operator,and structural genes?

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