What is agarose?

Agrobacterium tumefaciens contains a large plasmid that induces tumors in plants,known as:

Which enzyme facilitates the action of sticky ends of $DNA$?

Restriction endonuclease is used in

In the naming of restriction enzymes, the first letter is derived from $...A...$ name, the next two letters from the $...B...$, and the fourth letter from $...C...$ of $...D...$ where the enzymes are extracted.
$A$ to $D$ in the statement can be:

Give the types and functions of the Nuclease enzyme.