Which of the following genetically engineered microbes is used in the scavenging of oil spills by digesting hydrocarbons of crude oil?

How many polypeptide chains is human insulin composed of?

Consider the following statements about insulin.
$I.$ Human insulin is made up of $51$ amino acids arranged in two polypeptide chains.
$II.$ The two polypeptide chains are interconnected by two disulphide bridges.
$III.$ In mammals,including humans,insulin is synthesised as a pro-hormone,which contains an extra stretch called the $C$-peptide.
$IV.$ $C$-peptide is not present in the mature insulin.
Which of the statements given above are correct?

Differentiate between diagnostics and therapeutics. Give one example for each category.

Which of the following is used as a vector in gene therapy?

An example of gene therapy is