Question

Where does the lac repressor protein come from?

Answer 1

Lac operon:

1. Lac operon in E. coli contains genes involved in lactose metabolism.
2. It is only expressed when lactose is present.
3. Lactose can be broken down by E. coli bacteria.
4. It is not their preferred fuel.
5. They would use glucose if it was available.
6. Glucose is easier to digest and uses less energy than lactose.
7. If lactose is the only sugar available, E. coli will use it as an energy source.
8. To utilize lactose, bacteria must express the lac operon genes.
9. It encodes key lactose uptake and metabolism enzymes.