The vector used for delivery of $ADA$ $cDNA$ into cells of a patient receiving gene therapy is

Which of the following statements is not correct?

.......... works on the principle of antigen-antibody interactions.

What is the primary objective of genetic engineering?

Consider the following statements about therapeutic drugs:
$I$. The recombinant $DNA$ technology is used for the production of therapeutic drugs which are safe and effective.
$II$. It avoids unwanted immunological responses,commonly observed with similar products isolated from non-human sources.
$III$. About $30$ recombinant therapeutics have been approved for human use in the world,including India.
Which of the statements given above are correct?

$ELISA$ system is based on which of the following principles?