Which of the following components are used in gel electrophoresis?
$I.$ Ethidium bromide
$II.$ Restriction endonuclease
$III.$ Agarose
$IV.$ $UV$ radiation
Choose the correct option:

$I. ... A...$ 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:

Upon exposure to $UV$ radiation,$DNA$ stained with ethidium bromide will show:

In a mixture,$DNA$ fragments are separated by

What is the significance of adding proteases at the time of isolation of genetic material $(DNA)$?

In gel electrophoresis,separated $DNA$ fragments can be visualized with the help of: