NEET Exam Model Paper 14

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Question : 119 of 180

Marks: +1, -0

E.coli cells with a mutated Z gene of the operon cannot grow in medium containing only lactose as the source of energy because

The lac operon is constitutively active in these cells
They cannot synthesise functional βgalactosidase
In the presence of glucose E.coli cells do not utilise lactose
They can not transport lactose from the medium into the cell

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