In the naming of restriction enzymes the first letter is derived from$ …A…$ name and next two letters from the $…B…$ and fourth letter from $…C…$ of $…D…$ where the enzymes are extracted

$A$ to $D$ in the statement can be

Manipulation of $DNA$ in genetic engineering became possible due to the discovery of

Which of the following statement is correct in the context of observing DNA separated by agarose gel electrophoresis?

Assertion : Agrobacterium tumefaciens is popular in genetic engineering because this bacterium is associated with the roots of all cereal and pulse crops.

Reason : A gene incorporated in the bacterial chromosomal genome-gets automatically transferred to the crop with which the bacterium is associated.

Which of the following is not a method of introducing alien $DNA$  into host cells?