STD 12 - 5. molecular basis of inheritance — Biology STD 12 Science — Question

$I.$ Human insulin is made-up of $51$ amino acidsarranged in two polyperptide 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?

$R$ : Each restriction enzyme recognises a specific palindromic nucleotide sequence in the $DNA$.