Question

The presence of glucose in the environment typically causes catabolite repression. Explain why this confers an advantage to a bacterium

Answer 1

Glucose effect plays a very important function in bacteria.For many bacteria glucose is most common substrate for growth.Presence of glucose in the environment causes catabolite repression.Increase level of cyclic AMP in the cell repressing transcription from the lac operon.bacteria start lac operon and produce beta galactosidase enzymes for lactose metabolism.

Glucose is known as repressor for the enzymes that used for lactose utilization

advantage to bacteria is that ,it requires the cells to use best available source of energy.catabolite repressor inhibit indirectly the synthesis of enzyme that metabolize poorer source of energy .