Match List-I with List-II regarding the lac operon in E. coli . List-I List-II A. Presence of inducer I. Hydrolysis of lactose into galactose and glucose B. Absence of inducer II. Increases permeability of the cell to -galactosides C. y gene product III. Repressor binds to the operator region D. z gene product IV. Inactivates the repressor protein Choose the correct answer from the options given below:

Step-by-step solution

In the lac operon: A. Presence of inducer (lactose or allolactose) inactivates the repressor protein by binding to it, allowing RNA polymerase access to the promoter (A-IV). B. In the absence of an inducer, the active repressor binds to the operator region, preventing transcription of the structural genes (B-III). C. The y gene codes for permease, which increases the permeability of the cell to -galactosides (C-II). D. The z gene codes for -galactosidase, which is responsible for the hydrolysis of the disaccharide