The lac operon consists of which of the following?

Four regulatory genes only

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One regulatory gene and three structural genes

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Two regulatory genes and two structural genes

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Three regulatory genes and three structural genes

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Solution

The correct option is B One regulatory gene and three structural genes
The lac operon was studied in E. coli. It contains genes that are needed to produce proteins that are required to break down lactose when it is present in the cell. These 3 genes are Lac Z, Lac Y, and Lac A. Each code for B- galactosidase, Permease, and Transacetylase respectively. The lac operon consists of an additional promoter, in front of a regulator gene, the role of which is to ensure the RNA polymerase binds to the correct transcription initiator.

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