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Which of the following chemical is used in chemical transformation method?

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Which of the following chemical is used in chemical transformation method?

(a) Cu

(b) FeSO4

(c) SO2

(d) CaCl2

This question was posed to me by my college director while I was bunking the class.

Question is taken from Introduction of DNA to Host Cell in section Recombinant DNA Technology of Life Sciences

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Best answer
Right choice is (d) CaCl2

The best explanation: In order to increase the competency of a bacterial cell, chemical transformation method is used. Use of calcium chloride (CaCl2) can precipitate the surface of the cell membrane and make it more competent.

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