Q3 / 180 · NEET 2026 (Cancelled) · Botany
In the lac operon, the z gene codes for :
- Apermease
- Btransacetylase
- Correct answerCbeta-galactosidase
- Dthe repressor of lac operon
Solution
In the lac operon, the structural genes are z, y, and a.
The z gene codes for beta-galactosidase, which is primarily responsible for the hydrolysis of the disaccharide lactose into its monomeric units, galactose and glucose.
The y gene codes for permease, which increases permeability of the cell to beta-galactosides.
The a gene codes for a transacetylase.
The i gene codes for the repressor of the lac operon.
Answer: beta-galactosidase
The z gene codes for beta-galactosidase, which is primarily responsible for the hydrolysis of the disaccharide lactose into its monomeric units, galactose and glucose.
The y gene codes for permease, which increases permeability of the cell to beta-galactosides.
The a gene codes for a transacetylase.
The i gene codes for the repressor of the lac operon.
Answer: beta-galactosidase
Hence, the correct answer is option: 'C'.