Q. In lac operon the repressor protein binds with which part of DNA.

1. Regulatory gene
2. Operator gene
3. Promoter gene
4. Structural gene

Hello Student,
Please find answer to your question below:

Correct answer is 2. Operator gene
In the lac operon model the repressor protein is formed by regulator gene. In switch off state the repressor protein bind to the operator gene of the DNA. Due to which trancription and tranlation stops.