BIOL 1414 Lecture Notes - Lecture 10: Sos Response, Benzene, Aflatoxin
Document Summary
Lac operon weakly on lacks the repressor. Off: repressor protein was stuck to the operator. Now, the e. coli has been consumed by a baby, so it in the gut. It detects some lactose, that is the lactose enters the e coli cell very slowly (because the transporter is off). Well, the lactose binds to the repressor protein. This unfolds the site where it binds to the operator, so the repressor falls off. Now the operon is on, but weakly because the. Polymerase is able to weakly attach to the promoter and read down the operon making a single transcript that has all three genes on it. Now, translation occurs so the three proteins are made; Now we have b- galactosidase, transporter in the cell. So, lactose begins to be metabolized and more is transported inside the cell due to the presence of the transporter protein.