Multiple choice

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

  1. they cannot synthesise functional betagalactosidase

  2. they cannot transport lactose from the medium into the cell

  3. the lac operon is constitutively active in these cells

  4. in the presence of glucose, E.coli cells do not utilize lactose
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A Correct answer
Explanation

 E.coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of the energy because they cannot synthesise functional betagalactosidase.

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