What type of control is the SOS response regulon under?
A) only positive control
B) feedback transcription
C) only negative control
D) feedback inhibition
E) both positive and negative control

Question

Quizplus · Accepted Answer

The SOS response regulon is under both positive and negative control. It is positively regulated by the LexA protein which represses the expression of genes involved in DNA repair until DNA damage occurs. It is negatively regulated by the RecA protein, which promotes the cleavage of LexA and the expression of the DNA repair genes. This is an example of a feedback inhibition mechanism.

What Type of Control Is the SOS Response Regulon Under