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The colonies of recombinant bacteria appear white in contrast to the blue colonies of non-recombinant bacteria because of

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insertional inactivation of the coding sequence of an enzyme, $β$ galactosidase in recombinant bacteria.

inactivation of glycosidase enzyme in recombinant bacteria

insertional inactivation of the coding sequence of $α$ galactosidase in non-recombinant bacteria.

non-recombinant bacteria produce $\propto$ galactosides

answer is B.

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Chromogenic substance in the expt. Medium react with $β$ –galactosidase.

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