BIOL 1107 Midterm: Bio exam 2 review
Document Summary
In bacteria, scientists can manipulate gene control during. A lot is going on at once, so it cannot really occurring during pre translation or post translation. An energy trade off of gene control would be when a controlling mechanism is employed. Before transcription, which is slower, but more efficient in terms of energy. Transcription is longest, post translation is fastest. This has to do with the lac operon. The lac operon is induced when lactose is transported into the cell, and a fraction of the lactose is transformed by beta galactosidase into the inducer allolactose. Transport of lactose by the lac permease is inhibited by glucose, a phenomenon known as inducer exclusion. A high concentration of glucose in the environment of an e. coli cell would. Not lead to inducer promotion of the repressor protein, or cause excess transcription of the lac operon, or increase transport of both glucose and lactose into the cell.
