In negative control of transcription, how does the presence of an inducer affect transcription?
A) The inducer does not bind to the operator.
B) The inducer binds to the operator.
C) The inducer causes the repressor to bind to the operator.
D) The inducer prevents the repressor from binding to the operator.

Question

Quizplus · Accepted Answer

In negative control of transcription, the repressor protein binds to the operator region and prevents RNA polymerase from transcribing the gene. The presence of an inducer molecule can bind to the repressor and cause a conformational change that prevents it from binding to the operator, thus allowing RNA polymerase to transcribe the gene. Therefore, the presence of an inducer prevents the repressor from binding to the operator, and the transcription proceeds.

In Negative Control of Transcription, How Does the Presence of an Inducer