In $Ti$-plasmid, which of the following is removed:

The enzymes which are absolutely necessary for recombinant $DNA$ technology are

Identify the desirable characteristics for a plasmid used in $rDNA$ technology from the following.
$A$. Ability to multiply and express outside the host in a bioreactor.
$B$. $A$ highly active promoter
$C$. $A$ site at which replication can be initiated
$D$. One or more identifiable marker genes
$E$. One or more unique restriction sites.

Recombinant $DNA$ can be obtained by cutting pro-$DNA$ using:

In $pBR322$,what does the letter '$p$' stand for?

Find out the wrong statement.