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Treating bacteria with a divalent cation to help DNA enter uses:

ACaesium
BCalcium
CCadmium
DChromium
Answer & Solution
Correct answer: B. Calcium
1. A specific ion increases the uptake efficiency. 2. It is a common divalent cation. 3. That ion is calcium. _Source: syllabus Biology Class XII, Chapter 11, Biotechnology Principles and Processes._
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