The transfer of protein from electrophoretic gel to nitrocellulose membrane is known as

Choose the correct statement:
$P -$ Endonucleases cut the $DNA$ at a specific site inside the $DNA$.
$Q -$ $A$ stirred-tank reactor is usually square in shape.
$R -$ In order to force bacteria to take up the plasmid,the bacterial cells must first be made 'competent' to take up $DNA$ by treating them with a divalent cation like $Ca^{2+}$.

If a recombinant $DNA$ bearing a gene for resistance to Ampicillin is transferred into $E. coli$ cells,the host cells become transformed into Ampicillin-resistant cells. What happens when these $E. coli$ are grown on a medium containing Ampicillin?

$A$ transformed bacterium with a human gene fails to produce the desired protein. The reason could be:

Mention the main phases included in recombinant $DNA$ technology.

Which of the following methods is used for the isolation of $DNA$?