Question

Select the correct set of the names for A, B, C and D :-

	A	B	C	D
(A)	Proinsulin	B-Peptide	A-Peptide	Insulin
(B)	Proinsulin	A-Peptide	B-Peptide	Free C-Peptide
(C)	Proinsulin	A-Peptide	B-Peptide	Insulin
(D)	Proinsulin	B-Peptide	A-Peptide	Free C-Peptide

• A. D
• B. C
• C. A
• D. B

Answer 1

The correct option is D B

A → Proinsulin, B → A-peptide, C → B-peptide, D → Free C-Peptide
Pro insulin is the precursor of insulin which consists of ‘A’ chain bonded with ‘B’ chain by disulphide bridges and has free ‘C’ chain. Whereas mature insulin is free of ‘C’ peptide chain, so removal of ‘C’ peptide leads to insulin.

So, the correct answer is "option B"