Gujarati
5.Molecular Basis of Inheritance
medium

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

A

In the presence of glucose, E.coli cells do not utilize lactose

B

They cannot transport lactose from the medium into the cell

C

The lac operon is constitutively active in these cells

D

They cannot synthesize functional betagalactosidase

(AIPMT-2005)

Solution

(d)The enzyme like lactase or $\beta $-galactosidase which is formed in response to the presence of its called inducible enzyme.

Standard 12
Biology

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