In E.coli, the lac operon gets switched on when:
a. lactose is present and it binds to the repressor
b. repressor binds to operator
c. RNA polymerase binds to the operator
d. lactose is present and it binds to RNA polymerase
NCERT Class XII
Biology - Main Course Book
Chapter 6. Molecular Basis of Inheritance
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Option A -- is the answer.
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The answer is: (a) lactose is present and it binds to the repressor.
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