Question

What does the structural gene (y) of a lac operon code for?

• A. β-galactosidase
• B. Transacetylase
• C. Permease
• D. Glucagon

Answer 1

Answer:

C. Permease

The structural gene (z) of the lac operon codes for β-galactosidase. It is responsible for the hydrolysis of polysaccharides. The ‘y’ genes code for permease. It increases the permeability of a cell to β-galactosidase. The ‘a’ genes code for transacetylase.