Which of the following components are used ingel electrophoresis ?

$I.$ Ethidium bromide

$II.$ Restriction endonuclease

$III.$ Agarose

$IV.$ $UV$ radiation

Choose the correct option:

Biolistics (gene gun) is suitable for

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.

Name the five key tools for accomplishing the tasks of recombinant $\rm {DNA}$ technology. Also mention the functions of each tool.

Which of the following statement is not correct about cloning vector ?