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What can happen if competent cells are repeatedly frozen and thawed?

Answer and explanation

Correct answer: The cells’ competence and viability may decrease

Repeated freeze-thaw cycles can damage the cell membrane because of ice-crystal formation and temperature changes. This may reduce both cell viability and competence, i.e., the ability to take up external DNA, leading to lower transformation efficiency. It does not automatically increase recombinant colonies. Exam tip: store competent cells in small aliquots and thaw each aliquot only once when possible.

Related tags

Competent CellsFreeze ThawTransformation EfficiencyCell ViabilityGenetic TransformationBiotechnologyCompetent HostPrinciples Of Biotechnology

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