Yeast has become important in genetic engineering because it:

Match the following columns:

Column $I$	Column $II$
$A$. Recombinant $DNA$	$1$. Sea weeds
$B$. Gel electrophoresis	$2$. $DNA$ staining
$C$. Ethidium bromide	$3$. Plasmid $DNA$ that has incorporated human $DNA$
$D$. Agarose	$4$. Process by which $DNA$ fragments are separated based on their size

Which two $DNA$ molecules were joined to create the first artificial recombinant $DNA$?

In the given figure,what do '$R$','$S$',and '$T$' represent respectively?

Assertion : In recombinant $DNA$ technology,human genes are often transferred into bacteria (prokaryotes) or yeast (eukaryote).
Reason : Both bacteria and yeast multiply very fast to form huge population,which express the desired gene.

$A$ - Transformation is a procedure through which a piece of $DNA$ is introduced in a host bacterium.
$R$ - With the help of $PCR$,thousands of $DNA$ copies are formed.