The Adenosine deaminase deficiency results into:

Which of the following is produced using $E. coli$?

$E. coli$ is useful in the production of:

$A$: Recombinant $DNA$ technology is less effective in therapeutic drug production.
$R$: Recombinant therapeutics induce unwanted immunological responses.

How many of the following statements are correct?
$(i)$ Mature insulin is made up of $A, B$ and $C$ peptides.
$(ii)$ Removal of $C$-peptide helps in the maturation of insulin.
$(iii)$ In mature insulin,$C$-peptide is present.
$(iv)$ In insulin,chains $A$ and $B$ are linked by disulphide bonds.

Genetic engineering is connected with