$ADA$ deficiency results in

The main challenge for the production of insulin using $rDNA$ techniques was getting insulin into its matured form using $........$ bonds.

Which one of the following vectors is used to replace the defective gene in gene therapy?

In $1983$,Eli Lilly,an American company,first prepared two $DNA$ sequences corresponding to $A$ and $B$-chains of human insulin and introduced them into the plasmids of $Escherichia$ $coli$ to produce insulin chains. Chains $A$ and $B$ were prepared separately,extracted,and combined by creating:

Humulin is . . . . . . .

Find the incorrect statement.