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

Question

Quizplus · Accepted Answer

Negative control of transcription involves regulatory proteins that act as repressors, preventing transcription from occurring. The gene is only activated when the repressor protein is removed from the DNA. The presence of lactose (choice A) is a mechanism for positive control of transcription. Kinases (choice C) do not add phosphates to DNA in negative control of transcription. In negative control, it is the binding of regulatory proteins (choice D) that prevents transcription, not their absence.

In Negative Control of Transcription, a Gene Is Activated When