Yeast has become important in genetic engineering because it:

Read the following statements carefully and select the correct option $:-$
$(A)$ Source of the restriction enzyme Hind $II$ is Haemophilus influenzae.
$(B)$ If any protein encoding gene is expressed in a heterologous host,it is called as recombinant protein.
$(C)$ Microinjection method for injecting foreign gene is used for animal cell.
$(D)$ $\text{DNA}$ primers are chemically synthesized oligonucleotides that are complementary to the regions of $\text{DNA}$ in $\text{PCR}$.
How many of the above statements are correct?

Find the correct match.

$I$	$II$	$III$
$(a)$ $PCR$	$(i)$ Specific base sequence	$p.$ $Taq$ polymerase
$(b)$ Downstream processing	$(ii)$ Inheritable gene	$q.$ Ampicillin resistant
$(c)$ Restriction endonuclease	$(iii)$ Amplification of $DNA$	$r.$ $E. coli$
	$(iv)$ Product separation and modification	$s.$ Quality control

What do '$X$' and '$Y$' represent in the given figure of a stirred-tank bioreactor?

Which one of the following pairs is not correctly matched?

$A$: Selection of recombinants due to inactivation of antibiotics is a cumbersome procedure.
$R$: It requires simultaneous plating on two plates having different antibiotics.