The characteristics of a molecular probe are
$I.$ very long molecule
$II.$ double-stranded
$III.$ $DNA$ or $RNA$
$IV.$ complementary to a part of the desired gene
The correct pair is

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 of the following enzyme$(s)$ are $\text{NOT}$ essential for gene cloning?
$A.$ Restriction enzymes
$B.$ $\text{DNA}$ ligase
$C.$ $\text{DNA}$ mutase
$D.$ $\text{DNA}$ recombinase
$E.$ $\text{DNA}$ polymerase
Choose the correct answer from the options given below:

Which of the following is associated with genetic engineering?

Restriction endonucleases are enzymes which

The molecular scissors of $DNA$ are: