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Solution


Q.

The lactose present in the growth medium of bacteria is transported to the cell by the action of                 [2024]
1 beta-galactosidase  
2 acetylase  
3 permease  
4 polymerase  

Ans.

(3)

In the absence of glucose, if lactose is provided in the growth medium of the bacteria, the lactose gets transported into the cells by the action of enzyme permease encoded by lac y gene. A very low level of expression of lac operon has to be present in the cell all the time (otherwise lactose cannot enter the cells).