An improved variety of transgenic basmati rice

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 synthesized as a pro-hormone, which contains an extra stretch called the Cpeptide

$IV$. $C-$peptide is not present in the mature insulin

Which of the statements given above are correct?

Techniques that serve the purpose of early diagnosis include

Who coined the term $ ”antibiotics''$

A doctor while operating on $HIV$ positive patient accidently cuts himself with a scalpel. In order to confirm whether he has contracted the virus which of the following tests should be performed?