In negative control of transcription,a gene is activated when _____.
A)a kinase adds a phosphate to DNA
B)lactose is transported into the cell
C)a regulatory protein binds to DNA
D)a regulatory protein is removed from DNA

Question

Quizplus · Accepted Answer

In negative control of transcription, a regulatory protein (such as a repressor) binds to DNA to prevent or block transcription of a gene. When the regulatory protein is removed from DNA, transcription can occur. This is the case in the absence of a repressor in the lac operon of E. coli, which allows transcription of the lac genes and the metabolism of lactose. A kinase adding a phosphate to DNA or lactose transport into the cell are not typically involved in negative control of transcription. A regulatory protein binding to DNA initiates negative control, rather than activation.

In Negative Control of Transcription,a Gene Is Activated When _____