Which of the following bacteria is a close relative of $Salmonella$?

Match the Column-$I$ with Column-$II$:

Column-$I$	Column-$II$
$(a)$ $K$.$C$. Mehta	$(i)$ Fluid mosaic model
$(b)$ $P$. Maheshwari	$(ii)$ First recombinant plasmid
$(c)$ Cohen and Boyer	$(iii)$ Haploid culture
$(d)$ Singer and Nicolson	$(iv)$ Rust disease

$PCR$ is used to:

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

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?

$A$ - 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.