NEET2026BiologyChapterActual
Given below is a schematic representation of the lac operon where certain genes are labeled as A, B, C, and D. List I (Label) List II (Product) A Gene A 1 -galactosidase B Gene B 2 Permease C Gene C 3 Transacetylase D Gene D 4 Repressor protein Choose the correct answer from the options given below:
Options
- AA-4, B-1, C-3, D-2
- BA-1, B-4, C-2, D-3
- CA-4, B-1, C-2, D-3
- DA-4, B-2, C-1, D-3
Correct answer
C. A-4, B-1, C-2, D-3
Step-by-step solution
The given schematic represents the lac operon. Label A points to the i gene. The i gene codes for the repressor protein of the lac operon. Thus, A matches with 4. Label B points to the z gene. The z gene codes for -galactosidase, which is responsible for the hydrolysis of lactose into galactose and glucose. Thus, B matches with 1. Label C points to the y gene. The y gene codes for permease, which increases the permeability of the cell to -galactosides. Thus, C matches with 2. Label D points to the a gene. The a gen