Select the appropriate option for $Agrobacterium$ $tumefaciens$.

Assertion : Restriction enzymes cut the strand of $DNA$ to produce sticky ends.
Reason : Stickiness of the ends facilitates the action of the enzyme $DNA$ polymerase.

Insertional inactivation is performed by which enzyme?

Hind $II$ always cuts $DNA$ molecules at a particular site called recognition sequence and it consists of : (in $bp$)

Plasmids are suitable vectors for gene cloning because...

Give scientific reasons: In recombinant $DNA$ technology,the use of endonuclease is more proper than exonuclease.