$DNA$ probes are used in humans for

The two polypeptides of human insulin are linked together by

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 what form is human insulin synthesized,and what does it contain?

Which company first produced human insulin?

What is produced by genetically engineered bacteria?