(C) Haemoglobin consists of four polypeptide chains ($2 \alpha$ and $2 \beta$) having heme as a prosthetic group.Heme is an iron $(Fe^{2+})$ containin

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(C) Haemoglobin consists of four polypeptide chains ($2 \alpha$ and $2 \beta$) having heme as a prosthetic group.Heme is an iron $(Fe^{2+})$ containing porphyrin ring.One haemoglobin molecule binds four oxygen molecules,one per heme group,to form oxyhaemoglobin.The reaction is: $Hb + 4O_2 \rightleftharpoons Hb(O_2)_4$.