Which genetically modified organism is used for the commercial production of human insulin?

In which of the following microorganisms can vaccines be produced using recombinant $DNA$ technology?

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

Which of the following are used in $MRI$ to detect physiological changes in living tissues?
$(i)$ $UV$ rays $(ii)$ Strong magnetic fields $(iii)$ $\gamma$-rays $(iv)$ $X$-rays

In $1983$,an $.........$ company named $Eli$ $Lilly$ prepared two $DNA$ sequences corresponding to $A$ and $B$,chains of human insulin.

$ELISA$ is used to detect viruses,where: