$A$ bioreactor is

In which of the following methods is a probe allowed to hybridize to its complementary $DNA$ in a clone of cells?

Identify the following bioreactors.
$P \quad\quad Q$

Pure $DNA$ precipitated by the addition of chilled ethanol can be removed from the solution by

With respect to $DNA$ fragmentation:
Statement $A$: Gel electrophoresis and elution are two important processes.
Statement $B$: After staining with ethidium bromide,it has to be exposed to $UV$ light.

$PCR$ (Polymerase Chain Reaction) technique is useful in: