Which type of hemoglobin is not normally found within human erythrocytes?: (A) HbA, (B) HbA2, (C) HbCO, (D) HbO2
Answer is C. Adult erythrocytes normally do not contain any carboxyhemoglobin, which is formed when hemoglobin binds carbon monoxide. Ref : Biochemistry by U. Satyanarayana 3rd edition Pgno : 206