The tumour-inducing capacity of $Agrobacterium \; tumefaciens$ is located in large extra-chromosomal plasmids called

Genes of interest can be selected from a genomic library by using

Select the option that excludes characteristics applicable to plasmids:
$(a)$. Circular $DNA$
$(b)$. Linear $DNA$
$(c)$. Present in all bacteria
$(d)$. Contain essential genes
$(e)$. Extra chromosomal self-replicating

Which of the following enzymes cuts $DNA$ at specific sites?

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

Which one of the following is indispensable in genetic engineering?