The gene product of Lac A gene in lac operon is

1. Beta-galactoside permease

2. Beta-galactosidase

3. Beta-galactoside isomerase

4. Beta-galactoside transacetylase

The correct option is D

Beta-galactoside transacetylase

Lac operon is an operon responsible for metabolism and transport of lactose in E. coli and other bacteria. It has three structural genes (Lac Z, Lac Y, and Lac A) regulated by a single promoter and a single polycistronic mRNA is formed when these genes are transcribed. Below given table names the products of the structural genes:

Genes	Product
Z	β-galactosidase
Y	β-galactosidase Permease
A	β-galactosidase Transacetylase