Hemoglobin is composed of:
Correct answer: C. Two alpha and two beta chains
- A. Two alpha chains
- B. Two beta chains
- C. Two alpha and two beta chains
- D. Four alpha chains
Explanation
Hemoglobin is a protein found in red blood cells that carries oxygen throughout the body. It is composed of two alpha and two beta polypeptide chains, forming a quaternary structure. Each alpha chain contains 141 amino acids, while each beta chain contains 146 amino acids. This combination allows hemoglobin to effectively bind and transport oxygen.Options A, B, and D are incorrect because they suggest that hemoglobin is composed solely of either alpha or beta chains, which does not accurately represent its quaternary structure.
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