NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Zoology
- Chapter
- Molecular Basis of Inheritance
NEET 2026 · Zoology · Molecular Basis of Inheritance
In the lac operon, the z gene codes for :
In the lac operon, the z gene codes for :
Options
- Apermease
- Btransacetylase
- Cbeta-galactosidase
- Dthe repressor of lac operon
Correct answer
C. beta-galactosidase
Step-by-step 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