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After incubation on ice, competent cells are briefly placed at 42 degrees. This step is called:

AHeat wave
BHeat loss
CHeat shock
DHeat sink
Answer & Solution
Correct answer: C. Heat shock
1. A sudden temperature jump drives DNA inside. 2. The cells are then returned to ice. 3. That step is the heat shock. _Source: syllabus Biology Class XII, Chapter 11, Biotechnology Principles and Processes._
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