Question

The number of polypeptide chains in human hemoglobin is:

• A. One alpha chain and one beta chain
• B. Two alpha chains
• C. Two alpha chains and two beta chains
• D. One alpha chain and two beta chains

Answer 1

Answer:

C. Two alpha chains and two beta chains

The hemoglobin molecule is made up of four polypeptide chains: two alpha chains of 141 amino acid residues each and two beta chains of 146 amino acid residues each.