BIO 1140 Lecture Notes - Lecture 9: Regulatory Sequence, Operon, Repressor
Document Summary
Regulation is achieved through operons; genetic switches that control transcription (on/off) operons are a region that allows different on and off switches regulatory gene: when transcribted the messemger rna is turns into a protein. This protein has the ability to control if transcription happens. The geen ahs a coding sequence and a regulatory sequence. 3 separate mrnas, and ea66tch are under control of the same promoter ^^^ The operator is what will add the addition on and off switch. Where the repressor protein can go and bind there. The repressor depends on the concentration of lactose. No lactose: the repressor gene is active, therefore you transcribe the mrna and translate it into the repressor. Of lactose goes down again, the repressor will release the allolactose and bind to the operator again. In addition to the tic; activators and repressors control which genes are expressed and the rate at which transcription occurs. Not all will be transcribed in all cells types.