Question

In Lac Operon Z, Y, a and i indicates the following codes

• A. \(\beta\) galactosidase, permease, transacetylase, repressor
• B. Inducer, promoter, operator, repressor
• C. trp, ara, his, val
• D. Promoter, operator, repressor, inducer

Hint:

In the lac operon system, Z, Y, and A are key genes involved in the breakdown and uptake of lactose, and the repressor protein prevents transcription in the absence of lactose.

Answer 1

The Correct Option is A

Genes and Their Functions in the Lac Operon System

In the lac operon system:

• Z gene: Encodes for β-galactosidase, which is responsible for breaking down lactose.
• Y gene: Encodes for permease, which facilitates the transport of lactose into the cell.
• A gene: Encodes for transacetylase, which helps in the acetylation of lactose.
• I gene: Encodes for the repressor, which binds to the operator and prevents transcription in the absence of an inducer.

Thus, the correct combination for Z, Y, and A is:

β-galactosidase, permease, transacetylase, repressor.

Therefore, the correct answer is (A).