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5.Molecular Basis of Inheritance
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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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