The organism, which is used for gene transfer in higher plants is

Which one of the following is called the polynucleotide joining enzyme?

Select the correct pair.

The first restriction enzyme to be isolated and characterised was

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

The specific $DNA$ sequence where $Eco\ RI$ cuts is