NEET Biology question

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

(A)Insertional inactivation of beta-galactosidase in non-recombinant bacteria
(B)Insertional inactivation of beta-galactosidase in recombinant bacteriaCorrect
(C)Inactivation of glycosidase enzyme in non-recombinant bacteria
(D)Non-recombinant bacteria lacking beta-galactosidase

Answer: (B)

Solution

Non-recombinant bacteria retain an intact, functional beta-galactosidase gene and therefore turn blue on the chromogenic substrate, whereas in recombinant

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Question ID VK-124974