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Why is DNA purity important in transformation?

Answer and explanation

Correct answer: Impurities can reduce uptake and cell survival

DNA used for transformation should contain as little contaminating protein, salt, solvent, detergent, or degraded material as possible. Such impurities can interfere with the interaction between DNA and the competent cell membrane, reduce the efficiency of DNA entry, or damage and kill sensitive cells. Pure DNA therefore improves the chance that viable cells will receive and maintain the desired plasmid. Option D is correct because contaminants may reduce both uptake and survival, lowering the number of transformant colonies. Purity does not make water, and it is not merely a matter of DNA colour; the claim that impure DNA is always better is also false.

Related tags

Dna PurityTransformationCell SurvivalCompetent HostPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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