The thermostable enzymes $Taq$ and $Pfu$ are isolated from thermophilic bacteria,which are used as:

Restriction endonucleases are enzymes which

Which statement is correct for the $tet^R$ gene in the $pBR322$ plasmid?

Which of the following statements does not hold true for restriction enzymes?

$A$ plasmid $DNA$ and a linear $DNA$ (both are of the same size) have one site for a restriction endonuclease. When cut and separated on agarose gel electrophoresis,the plasmid shows one $DNA$ band while the linear $DNA$ shows two fragments. Explain.

Match the following enzymes with their functions:

$(a)$ Restriction endonuclease	$(i)$ Joins the $DNA$ fragments
$(b)$ Restriction exonuclease	$(ii)$ Extends primers on genomic $DNA$ template
$(c)$ $DNA$ ligase	$(iii)$ Cuts $DNA$ at specific positions
$(d)$ $Taq$ polymerase	$(iv)$ Removes nucleotides from the ends of $DNA$

Select the correct option from the following: