When foreign $DNA$ and a plasmid are cut by the same restriction endonuclease,which enzyme is used to join them to form a recombinant plasmid?

In recombinant $DNA$ technology,the term vector refers to a

Given below are two statements.
Statement $I$: Restriction enzyme $BamHI$ has its recognition site in $tet^R$ region of $pBR322$.
Statement $II$: $E. coli$ having $pBR322$ with a desired $DNA$ if inserted at $BamHI$ site can grow in medium containing tetracycline.
In the light of the above statements, choose the correct answer from the options given below.

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

In Recombinant $DNA$ technology,antibiotics are used:

Hind $II$ cuts the $\text{DNA}$ molecule at a particular point by recognizing a specific sequence of how many base pairs?