Question

How many amino acids are present in insulin?

• A. $25$
• B. $51$
• C. $20$
• D. $22$
• E. $52$

Answer 1

The correct option is B $51$

Insulin is composed of two peptide chains refferred to as the A chain and B chain. A and B chains are linked together by two disulfide bonds, and an additional disulfide is formed within the A chain. In most species, the A chain consists of 21 amino acids and the B chain of 30 amino acids.

So, there is a total of $51$ amino acids are present in insulin.
Hence, (b) is correct.