With regard to insulin choose correct option

Q. With regard to insulin choose correct options:

(a) C-peptide is not present in mature insulin.

(b) The insulin produced by rDNA technology has Cpeptide.

(c) The pro-insulin has C-peptide

(d) A-peptide and B-peptide of insulin are interconnected by disulphide bridges.

Choose the correct answer from the options given below: [NEET 2021, Biology]

(1) (a) and (d) only

(2) (b) and (d) only

(3) (b) and (c) only

(4) (a), (c) and (d) only

Answer (4)

Solution: Insulin is synthesized as a pro-hormone which contains A-chain, B-chain and an extra stretch called the C-peptide. C-peptide is not present in mature insulin called humulin. Chains A and B are connected by interchain disulphide bridges.