Which of the following is a suitable vector for gene cloning in higher organisms?

Which of the following is used to stain separated $DNA$ fragments so that they can be visualized?

The first restriction endonuclease type $II$,$...A..$,was isolated by Smith,Wilcox and Kelley from $...B...$ bacterium. It was found to cut $DNA$ molecules at a particular point by recognizing a specific sequence of six base pairs,known as the $...C....$. Here $A, B$ and $C$ can be:

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

The enzyme known as restriction endonuclease:

Plasmids are found in