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CGP EDU Academic Team
Published on: August 13, 2026
In presence of chromogenic substrate, recombinant bacteria will give
Text Solution
Verified by ExpertsThe correct answer is:
B
In blue-white screening, the chromogenic substrate (like X-gal) is used. If recombinant bacteria have insertional inactivation of the lacZ gene, they cannot produce β-galactosidase enzyme, so no blue pigment is formed → colonies remain colourless (white).
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