#Id: 6361
#Unit 2. Cellular Organization
Repressors bind to specific sites on the DNA. In bacterial cells, such binding sites, called operators
Regulation by means of a repressor protein that blocks transcription is referred to as negative regulation. Activators provide a molecular counterpoint to repressors; they bind to DNA and enhance the activity of RNA polymerase at a promoter; this is positive regulation.Repressor binding to DNA is regulated by a molecular signal called effector
