Need help with lactose gene. For the third one, I-O+Z- , why is
a nonfunctional enzyme made? I thought if there is NO lactose, then
no enzyme is made? Plus, there is no Z gene too. There is Z- here.
This is true for almost all the ansswers.
Question #3: Next the interviewer moved to your general knowledge of bacterial gene expression and its regulation using the lac operon as the point of questioning. He presented you with the table below (summary of a series of experiments using “regular bacteria and F’ merozygotes) and asked you to fill in the columns with a X) to identify if functional A-galactosidase is made, nonfunctional A-galactosidase is made, or if no enzyme is made. Functional Nonfunctional Media Type Genotype No Enzyme Enzyme Enzyme made Made Made No lactose Lactose O-+Z. No lactose O-+Z. Lactose No lactose Lactose Lactose No lactose No lactose Lactose f necessary, use the space below for any diagrams and/or explanations for the answers