Which of the following methods can be used for making the bacterial...

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Which of the following methods can be used for making the bacterial cell "competent"?
(1) Treating with specific concentration of divalent cation \( \left(\mathrm{Ca}^{+2}\right) \)
\( \mathrm{P} \)
(2) Treating with specific concentration of monovalent cation \( \left(\mathrm{K}^{+}\right) \)
W
(3) Heat shock
(4) Both (1) \& (3)
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