Iron is complexed in haemoglobin to-------

Options :
  1. Leucine
  2. Histidine
  3. Isoleucine
  4. Valine

Answer and Explanation :-

Answer: Option 2


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Who is it who decides that one man should live and another should die? My life wasn't worth any more than his, but he's the one who's buried, while I get to enjoy at least a few more hours above the ground. Is it chance, random and cruel, or is there some purpose or pattern to all this, even if it lies beyond our ken?"-Roran
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