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Solution


Q.

In an E. coli strain i gene gets mutated and its product cannot bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome     [2022]
1 Only z gene will get transcribed  
2 z, y, a genes will be transcribed  
3 z, y, a genes will not be translated  
4 RNA polymerase will bind the promoter region  

Ans.

(3)

In lac operon, lactose is an inducer. It binds with repressor and inactivates it.