but they are inducible (i.e., they can be turned on by a signal). For example, repression of the lac operon by its repressor, called lacI, is inhibited by the ligand allolactose, to which the ...

Last week I finally addressed promoters and gave a bit of background on the lac operon. Looking back, I feel that I didn't give the topic of operons adequate treatment. They are a very crucial ...

The lac repressor, which is produced from the lacl gene, regulates the transcription of the lac operon. The repressor binds to the lac operator to inhibit its transcription.