One molecule of Hb can bind to a maximum number of: (A) Two molecules of oxygen, (B) One molecule of oxygen, (C) Four molecules of oxygen, (D) Six molecules of oxygen
Answer is C. Hemoglobins bind four molecules of O2 per tetramer, one per heme. A molecule of O2 binds to a hemoglobin tetramer more readily if other O2 molecules are already bound.Reference: Harper&;s Biochemistry; 30th edition; Chapter 6; Proteins: Myoglobin & Hemoglobin