Genetically engineered human insulin is prepared by using:

In the treatment of $ADA$ deficiency during gene therapy,which cells are collected from the patient's blood?

Which company first produced human insulin?

Statement-$I$: At present, $30$ recombinant therapeutics have been approved for human use the world over.
Statement-$II$: Recombinant therapeutics do not induce unwanted immunological responses, as is common in the case of similar products isolated from non-human sources.
Choose the correct answer from the options given below:

How many of the following statements are incorrect?
$I.$ Genes of Agrobacterium are used to produce humulin.
$II.$ Indian government has set up $\text{GEAC}$.
$III.$ $\alpha-1$-antitrypsin is used to treat $\text{PKU}$.
$IV.$ $\text{ELISA}$ serves the purpose of early diagnosis.
$V.$ Flavr-savr is a variety of pomato.

Why would the $lac Z$ gene be fused to the coding sequence of chain $A$ and $B$ in plasmids of $E. coli$?