Answer the following question given this paragraph: 

When lactose is absent, a repressor protein binds to the operator. The operator is located between the promoter and the three lac operon genes. The protein blocks the binding of RNA polymerase to the promoter. As a result, the lac genes are not expressed.


Q: When lactose is absent, a repressor protein binds to what?

 Choices:

- differential

- network

- worker

- operator

A:
operator
