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Solution


Q.

Which one of the following acts as an inducer for lac operon                  [2023]
1 Sucrose  
2 Lactose  
3 Glucose  
4 Galactose  

Ans.

(2)

Lactose is the substrate for the enzyme beta-galactosidase and it regulates switching on and off of the Lac operon. Therefore, it acts as inducer.