Which of these enzymes is required to cleave a plasmid?

Which one of the following statements is not correct about a plasmid?

Endonuclease . . . . . . .

Restriction enzymes are used in genetic engineering because they

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

$A$ plasmid