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

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.

Which enzyme is used to join the ends of two strands of nucleic acid?

Select the incorrect statement.

Genetic engineering is possible because

Which of the following is important in genetic engineering?