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Which divalent cations are usually used to make competent cells?

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in Biology – Class 12 by (271k points)
Which divalent cations are usually used to make competent cells?

(a) Carbon

(b) Nitrogen

(c) Copper

(d) Calcium

I have been asked this question during an internship interview.

Query is from Tools of Recombinant DNA Technology: Competent Host topic in division Biotechnology Principles and Processes of Biology – Class 12

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Right option is (d) Calcium

To elaborate: The divalent cations of calcium are used to make cells competent. Calcium is used in the form of a salt of calcium chloride. It increases the efficiency of the bacterial membrane to allow the passage of foreign DNA.

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