This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'False statement about hemoglobin structure? \nSelect and explain. \nA. Hb has 2 polypeptide, B. Iron is present in ferrous state, C. Hb structurally similar to myoglobin, D. Ferrous ions are in porphyrin rings', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Each hemoglobin molecule is made up of:- (i) Non-protein part, i.e. heme; and (ii) Globin, which has 4 polypeptide chains (2 pairs of similar polypeptide chains).\nIron of hemoglobin is in the ferrous state which lies in the center of the porphyrin ring.\nMyoglobin and the β-subunits of hemoglobin share almost identical structures.', 'role': 'assistant'}]