Detemine expressed b-galactosidase

Home Blog Detemine expressed b-galactosidase

Detemine expressed b-galactosidase

Question: The question is to detemine whether B-galactosidase is expressed under specified situations:
Genotype Glucose only Lactose only Neither glucose nor lactose
I+ P+ O+ Z- / F’ I- P+ Oc Z+ – + +

The answer indictes that the B-galactosidase is expressed whether lactose is present or not. I am confused because I thought that if an I- or Oc (both constituatives) were aIDed to the cell on an F’ then the inducibility is maintained. So I would have thought that the gene would only be expressed if lactose is present (incibility). My question is why is the gene expressed when lactose is not present?


Add comment

Academic Research Pro