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Hemoglobin question

Discussion in 'MCAT Study Question Q&A' started by Revilla, Dec 7, 2008.

  1. Revilla

    Revilla New Member
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    Very basic -- how many iron atoms are there in a molecule of Hemoglobin? I know there are four oxygens, but are there four irons or just one?
     
  2. StIGMA

    StIGMA Doctor Professor
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    There are 4 Fe atoms in (tetrameric) hemoglobin. Hemoglobin has 2 alpha and 2 beta subunits. Each subunit has a prosthetic heme group, which is chelated to an iron atom.
     
  3. Revilla

    Revilla New Member
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    (1) Thanks for the answer!
    (2) Thanks for that quick reply! Much appreciated!
     

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