$DNA$ fragments can be separated by using which of the following techniques?

$I.$ In the process of recombinant $DNA$ technology,after several treatments,the purified $DNA$ is precipitated by adding chilled ethanol.
$II.$ The bacterial,plant,or animal cell is broken down by enzymes to release $DNA$,along with $RNA$,proteins,polysaccharides,and lipids.
Choose the correct option for the above statements.

The technique involving the insertion of a desired gene into the $DNA$ of a plasmid vector is known as:

What is the criterion for the movement of $DNA$ fragments on an agarose gel during gel electrophoresis?

In which step of $PCR$ do the primers anneal to the $DNA$ template?

Separation of $DNA$ fragments is done by a technique known as: