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Why is ice incubation useful in chemical transformation?

Answer and explanation

Correct answer: To keep cells stable

The direct answer is A: ice incubation helps keep competent cells stable. In chemical transformation, cells are prepared so that DNA can come close to or cross the cell envelope. Keeping the cell-DNA mixture cold helps maintain the prepared state and reduces unwanted damage before the controlled heat-shock step. Heat shock is then applied for a defined time and temperature, followed by recovery. The cold step is not the same as heat shock; together, the controlled sequence supports transformation. Option A is correct because stability is the relevant purpose. Option B is wrong because ice does not burn DNA. Option C is wrong because the aim is not to dry the host. Option D is wrong because ice incubation does not dissolve agar. A useful cue is: cold prepares and stabilizes; heat shock gives the brief controlled stimulus.

Related tags

Ice IncubationChemical TransformationCell Stability

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