In the Lac-operon of Escherichia coli, there are three adjacent structural genes viz., lac Z, lac Y, and lac A. Lac A gene codes for

Beta glactosidase

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Beta galactoside transacetylase

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Beta galactoside permease

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Polymerase

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Solution

The correct option is D Beta galactoside transacetylase
Lac operon consists of three structural genes, a promoter, a terminator, regulator and an operator. the three structural genes are:
lacZ - gene for B-galactosidase
lacY - gene for B-galactosidase permease
lacA - gene for B-galactosidase transacetylase.
Thus, the correct answer is option (B).

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