Question

Identify A and B in the figure given below.

• A. A: Proinsulin, B: C peptide
• B. A: C peptide, B: Proinsulin
• C. A: Insulin, B: C peptide
• D. A: Insulin, B: Proinsulin

Answer 1

The correct option is A A: Proinsulin, B: C peptide

Insulin is produced as a prohormone by the beta cells of islets of Langerhans. Proinsulin is a single polypeptide chain composed of the A and B subunits joined by the C peptide stretch. This C peptide is not present in the mature insulin and is removed during the maturation process.