Biology 8th Edition by Kenneth Mason ,Jonathan Losos,Susan Singer,Peter Raven,George Johnson

تمرين 6

Negative control of transcription in a prokaryotic cell involves _________ molecules that alter the conformation of ________ proteins that bind to DNA and prevent transcription.
A) operator; repressor
B) activator; RNA polymerase
C) activator; operator
D) effector; repressor