$I. … A…$ is the ability of a cell to take up foreign $DNA$

$II.$ The cell is treated with specific concentration of a divalent cation such as $… B…$ to increase pore size in cell wall

$III. $In $…C…$ method recombinant $DNA$ is directly injected into the nucleus of an animal cell

The most appropriate option regarding $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ is

Which of the following techniques is most commonly used to separate $DNA$ molecules by size?

Identify the part $A$ and $B$ from the given figure :

In recombinant $DNA$ technique, the term vactorrefers to a

Can you think and answer how a reporter enzyme can be used to monitor transformation of host cells by foreign $DNA$ in addition to a selectable marker?