Question

Human insulin contains how many amino acids on B chain?

• A. $51$
• B. $21$
• C. $30$
• D. $31$

Answer 1

The correct option is C $30$

Insulin is a protein which is made up of two polypeptide chains. The two polypeptide chains are designated as A and B. A chain has 21 amino acid residues and B chain has 30 amino acid residues. The two chains are linked by disulphide bonds.

So, the correct answer is C.