Question

In the Lac operon system, β-galactosidase is coded by

• A. a-gene
• B. y-gene
• C. z-gene
• D. I-gene

Answer 1

The correct option is C

z-gene

The lac operon consists of one regulatory gene (i-gene) and three structural genes (z, y, a). z-gene codes for β-galactosidase (β-gal) which is responsible for the hydrolysis of the disaccharide lactose into its monomeric units galactose and glucose.