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

Consider the following statements:
$I.$ Recombinant $DNA$ technology,popularly known as genetic engineering,is a stream of biotechnology which deals with the manipulation of genetic material by man in vitro.
$II.$ $pBR322$ is the first artificial cloning vector developed in $1977$ by Bolivar and Rodriguez from $E. coli$ plasmid.
$III.$ Restriction enzymes belong to a class of enzymes called nucleases.
Which of the statements given above are correct?

'Cloning' is meant for

Give differences between $PCR$ and plasmid.

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

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