Identify the true statements regarding the heme group of myoglobin and hemoglobin. ( Hint: there are 5 correct answers) a.A heme group contains four pyrrole rings, which are linked via methene (methine) bridges. b.The heme group is conjugated. c.The globin chains of myoglobin and hemoglobin prevent the oxidation of Fe₂ to Fe₃ , which irreversibly binds oxygen. d.The cooperativity of oxygen binding in hemoglobin arises from electronic interactions between heme groups. e.The T state of hemoglobin has lower affinity for O₂ than the R state because the Fe–Nporphyrin bonds are longer. f.Hemoglobin contains four heme groups. g.The iron in the heme group can form six bonds: The fifth is with an imidazole ring of a histidine and the sixth is with oxygen.
