What are $amp^R$ and $tet^R$?

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.

In the nomenclature of the enzyme $Restriction$ $Endonuclease$,what does the Roman numeral indicate?

The organism, which is used for gene transfer in higher plants is

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

$A$ simple segment of a $DNA$ strand is shown,which provides the base sequence for its complementary strand. What is specifically indicated here?