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When is a cell considered transformed?

Answer and explanation

Correct answer: When foreign DNA enters it

The governing concept is transformation, meaning the uptake and maintenance of foreign genetic material by a cell. In recombinant DNA work, a host cell is considered transformed when it receives the introduced DNA, often a recombinant plasmid, and retains it sufficiently to be detected or expressed. Selection markers such as antibiotic-resistance genes may help researchers identify cells that have taken up the construct, although marker detection is a later screening method rather than the definition itself. Therefore, option A is correct. Loss of shape, dehydration, or light emission does not define genetic transformation; those changes describe unrelated physical or physiological conditions.

Related tags

TransformationForeign DnaSelectable MarkerCompetent HostPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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