A site of negative genetic regulation where binding by repressor blocks transcription is the
A)operon.
B)repressor.
C)promoter.
D)operator.
E)CAP.

Question

Quizplus · Accepted Answer

The operator is the site of negative genetic regulation in a prokaryotic operon, where binding of the repressor protein blocks transcription. The promoter is the site where RNA polymerase binds to initiate transcription, and CAP is a transcriptional activator protein. The operon is the entire unit of genes regulated by the same promoter and operator. Therefore, D is the best choice.

A Site of Negative Genetic Regulation Where Binding by Repressor