Match List I with List II regarding the regulation of the lac operon: List I List II A Inducer 1 Binding site for RNA polymerase B Operator 2 Binds to operator to prevent transcription C Promoter 3 Binds to repressor to inactivate it D Repressor 4 Binding site for repressor protein Choose the correct answer from the options given below:

Step-by-step solution

In the regulation of the lac operon: The inducer (lactose or allolactose) binds to the repressor protein and inactivates it, preventing it from binding to the operator. Thus, A matches 3. The operator is the specific DNA sequence where the active repressor protein binds to block transcription. Thus, B matches 4. The promoter is the DNA sequence where RNA polymerase binds to initiate transcription. Thus, C matches 1. The repressor is the protein that binds to the operator region to prevent RNA polymerase from transc