Which restriction site is present in the $amp^R$ gene in $pBR322$?

In recombinant $DNA$ technique,the term vector refers to a

Which lytic enzyme is used to isolate $\text{DNA}$ from a bacterial cell?

The chemical knives of $DNA$ are:

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

........ make cuts at specific positions within the $DNA$.