Which microorganisms are commonly used to produce vaccines through recombinant $DNA$ technology?

The first human hormone prepared by using recombinant $DNA$ technology is?

The diagram below shows:

Find the correct statements from the following:
$I.$ Gene therapy is a genetic engineering technique used to treat diseases at the molecular level.
$II.$ Calcitonin is a medically useful recombinant product in the treatment of infertility.
$III.$ Bt toxin is a biodegradable insecticide obtained from $Bacillus \text{ } thuringiensis$.

How is a permanent cure for $ADA$ deficiency possible?

The first human drug made by using genetic engineering technique was