What are the cells obtained from a cancerous tumor called?

$K_{12}$ plasmid was studied first in

Biolistics method is suitable for gene transfer into . . . . . .

Who discovered that restriction enzymes have the capability of cutting $DNA$ strands in a particular fashion,which left what has become known as 'sticky ends' on the strands?

In $EcoR\, I$,what do the letters $E$ and $R$ stand for,respectively?

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.