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

The ability to multiply copies of an antibiotic resistance gene in $E. coli$ is called.....

The production of human proteins in bacteria through genetic engineering is possible because

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?

Assertion $:-$ The tumor inducing $(Ti)$ plasmid of $Agrobacterium$ $tumefaciens$ has now been modified into a cloning vector.
Reason $:-$ Retroviruses have been disarmed and are now used to deliver genes into animal cells.

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