Question

Number of amino acids in polypeptide chain A and polypeptide chain B of insulin

• A. A=30, B=21
• B. A=26, B=25
• C. A=21, B=30
• D. A=25, B=26

Hint:

Memorise insulin chain lengths: A = 21 aa, B = 30 aa.

Answer 1

The Correct Option is C

• Native insulin consists of two peptide chains: A chain = 21 amino acids; B chain = 30 amino acids.
• Therefore correct option is (3) A=21, B=30.