Which of these is used as a vector in gene therapy for $SCID$?

Which enzyme was targeted during the first clinical gene therapy given in $1990$ to a $4$ year old girl?

How many of the following statements are correct?
$(i)$ Mature insulin is made up of $A, B$ and $C$ peptides.
$(ii)$ Removal of $C$-peptide helps in the maturation of insulin.
$(iii)$ In mature insulin,$C$-peptide is present.
$(iv)$ In insulin,chains $A$ and $B$ are linked by disulphide bonds.

In which bacteria was the gene for insulin cloned?

Which among the following is used to treat Emphysema?

Which of the following is a correct statement with respect to animal insulin?