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

$DNA$ can be studied after staining with . . . . . . in various fields.

Which of the following tools of recombinant $\text{DNA}$ technology is incorrectly paired with its use?

$A$: Restriction enzymes belong to a larger class of enzymes called nucleases.
$R$: Each restriction enzyme recognizes a specific palindromic nucleotide sequence in the $DNA$.

Which of the following is important in genetic engineering?

Select the correct option regarding $Taq$ polymerase.