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What is done to make bacterial cell competent to take up DNA?

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What is done to make bacterial cell competent to take up DNA? 

(A) Treating bacterial cell with divalent cation.

(B) Treating bacterial cell with divalent anion. 

(C) Incubating bacterial cell and recombinant DNA on ice. 

(D) Exposing bacterial cell to heat shock.

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1 Answer

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(A) Treating bacterial cell with divalent cation.

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