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What can a very long heat shock do in transformation?

Answer and explanation

Correct answer: It can reduce cell survival

In heat-shock transformation, temperature and exposure time must be controlled. A brief, appropriate heat pulse can help create a temporary change in the cell envelope that promotes plasmid entry, but the cells remain vulnerable during this treatment. If the heat shock is much longer than the validated condition, excessive thermal stress can damage membranes, denature cellular proteins, and reduce viability. Consequently, fewer cells may recover and form colonies, even if some DNA enters. Option C is correct. A longer treatment does not guarantee perfect uptake, and the other choices describe impossible changes to the host or plasmid.

Related tags

Heat ShockDna TransformationCell SurvivalCompetent HostPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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