A patient with sickle cell anemia has a mutation affecting the oxygen-carrying protein. How many polypeptide chains compose a normal adult hemoglobin molecule?
Q1. A patient with sickle cell anemia has a mutation affecting the oxygen-carrying protein. How many polypeptide chains compose a normal adult hemoglobin molecule?
Answer: Four
Explanation: Hemoglobin has four chains (2 alpha, 2 beta); myoglobin is a single polypeptide chain often confused with hemoglobin's subunits.