Name a recombinant vaccine that is currently being used in a vaccination program.

Give the full form of $CT$ and $MRI$. How are they different from each other? Where are they used?

In the $RNAi$ method,what is the source of the complementary double-stranded $RNA$?

$A$ patient is suffering from $ADA$ deficiency. Can he be cured? How?

Statements related to human insulin are given below. Which statement$(s)$ is/are correct about genetically engineered insulin?
$(a)$ Pro-hormone insulin contains an extra stretch of $C$-peptide.
$(b)$ $A$-peptide and $B$-peptide chains of insulin were produced separately in $E. coli$,extracted,and combined by creating disulfide bonds between them.
$(c)$ Insulin used for treating diabetes was extracted from cattle and pigs.
$(d)$ Pro-hormone insulin needs to be processed for converting into a mature and functional hormone.
$(e)$ Some patients develop allergic reactions to the foreign insulin.
Choose the most appropriate answer from the options given below:

Which enzyme is used in the $ELISA$ test?