RRB Paramedical Staff Nurse Model Paper 2

${\mathrm{CaCl}}_2$ can be used to make the bacterial cell a permeable cell, and by introducing these cells (after ${\mathrm{CaCl}}_2$ being placed into the mixture of bacterial cells), a plasmid for ampicillin resistance can be transformed into the bacteria. The standard method for making the bacteria permeable to DNA involves treatment with calcium ions