Given below is a schematic representation of the lac operon. Match the labelled regions (A, B, C, D) in List I with their respective functions or descriptions in List II. List I List II A Label A I Binding site for RNA polymerase B Label B II Codes for repressor protein C Label C III Codes for -galactosidase D Label D IV Binding site for repressor protein Choose the correct answer from the options given below:

Step-by-step solution

Based on the schematic representation of the lac operon: Label A represents the i gene. It is the regulatory gene that codes for the repressor protein. Therefore, A matches with II. Label B represents the promoter ( p ) region for the structural genes. The promoter is the specific sequence where RNA polymerase binds to initiate transcription. Therefore, B matches with I. Label C represents the operator ( o ) region. The operator serves as the binding site for the repressor protein, which regulates the transcription