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E. coli cell with a mutated Z gene of th...

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

A

the lac operon is contitutively active in these cells

B

they cannot synthesize functional `beta`-galactosidase

C

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

D

they cannot transport lactose from the medium into the cell

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The correct Answer is:
B
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GRB PUBLICATION-GENE EXPRESSION AND REGULATION-NCERT Corner(Exemplar Problems)
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