$Taq$ polymerase is isolated from a bacterium,$Thermus$ $aquaticus$.

An antibiotic resistance gene in a vector usually helps in the selection of

The $...A...$ are the $DNA$ molecules that can carry a foreign $...B...$ segment into the host cell. Here $A$ and $B$ refer to:

Restriction enzymes belong to which class of enzymes?

Match the enzymes in Column-$I$ with their respective functions in Column-$II$.

Column-$I$	Column-$II$
$P$. Restriction endonuclease	$I$. Synthesizes $DNA$ copies
$Q$. $DNA$ polymerase	$II$. Cleaves $DNA$ molecules
$R$. $DNA$ ligase	$III$. Joins $DNA$ molecules

The diagram below represents a schematic of recombinant $DNA$ technology. Which enzymes are responsible for the processes $P$ and $Q$ respectively?
$\quad\quad P\quad\quad\quad Q$