Biology, asked by hridaymazumder3229, 11 months ago

iron combines with porphyrin to form

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Answered by Anonymous

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Porphyrins have complex cyclic structures. ... The iron atom is kept in the centre of the porphyrin ring by interaction with the four nitrogen atoms. The iron atom can combine with two other substituents; in oxyhemoglobin, one substituent is a histidine of the protein carrier, and the other is an oxygen molecule.

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