3. Which of the following descriptions about Hb (hemoglobin) is      incorrect     ?
(A) One Hb can bind one O₂ molecules
(B) HbA has an α₂β₂ structure
(C) HbF has an α₂γ₂ structure
(D) HbA has a higher affinity for BPG than does HbF
(E) CO₂ reduces the binding affinity of Hb for O₂.

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