The heme portion of the hemoglobin molecule consists of:
Correct Answer: Four porphyrin rings, each containing a molecule of Fe in the center
Description: Structurally, porphyrin consists of four pyrrole rings (five-membered closed structures containing one nitrogen and four carbon atoms) linked to each other by methine groups (−CH=).
The iron atom is kept in the centre of the porphyrin ring by interaction with the four nitrogen atoms.
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