To turn genes off,a regulatory protein called a(n)__________ is bound to a regulatory site so that RNA polymerase is blocked.
A)repressor
B)translator
C)signal molecule
D)operon

Question

Quizplus · Accepted Answer

A repressor protein binds to a regulatory site on DNA to block RNA polymerase from transcribing the gene. This is a common mechanism for turning genes off in prokaryotic and eukaryotic cells. Translator and signal molecules are not directly involved in gene regulation, and an operon is a set of genes controlled by a common regulatory element, which may include a repressor protein.

To Turn Genes Off,a Regulatory Protein Called A(n)__________ Is Bound