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?

What do '$S$' and '$T$' represent in the given figure of a stirred-tank bioreactor?

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?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ $EFB$	$(1)$ Recognition sequence
$(b)$ Biotechnology	$(2)$ Molecular scissors
$(c)$ Restriction enzyme	$(3)$ Definition of biotechnology
$(d)$ Palindromic sequence	$(4)$ Test tube baby

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