What happens if a foreign $DNA$ fragment is inserted into the coding sequence of the $\beta$-galactosidase enzyme in a plasmid containing the coding sequence for the $\beta$-galactosidase enzyme?

Which of the following statements is incorrect?

Which of the following diagrams is correct for primer annealing in $PCR$?

The process of joining together different $DNA$ fragments is often referred to as

What is the charge on $DNA$ and towards which electrode does it migrate during gel electrophoresis?

$I. ... A...$ is the ability of a cell to take up foreign $DNA$.
$II.$ The cell is treated with a specific concentration of a divalent cation such as $... B...$ to increase the pore size in the cell wall.
$III.$ In $...C...$ method,recombinant $DNA$ is directly injected into the nucleus of an animal cell.
The most appropriate option regarding $A, B$ and $C$ is: