For instance , if a bacterium finds itself in a broth containing lactose , rather than the simpler sugar glucose , it must adapt itself to the need to 1 ) import lactose , 2 ) cleave lactose to its constituents glucose and galactose , and 3 ) convert the galactose to glucose .
For instance , if a bacterium finds itself in a broth containing lactose , rather than the simpler sugar glucose , it must adapt itself to : It was known that cells increase the enzymes for these steps when exposed to lactose .