Which of the following is used for gene transfer in animals?

$\alpha-1$ antitrypsin is used to treat which disease?

Removal of which chain results in maturation of proinsulin to insulin?

$ELISA$ is used to detect viruses,where:

The first clinical gene therapy was given for treating

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 $Bacillus \text{ } thuringiensis$.