The Polymerase Chain Reaction $(PCR)$ is a reaction in which amplification of specific $DNA$ sequences is carried out in vitro. This statement is

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 $Ca^{2+}$.

In which of the following wells was undigested $DNA$ loaded?

Transformation is a process in which ..........

$A$ : Taq Polymerase is involved in $PCR$ technique.
$R$ : This enzyme remains active during the high temperature including denaturation of double stranded $DNA$.

The entry of $t-DNA$ into plants is associated with which of the following?