Pathology The heme portion of the hemoglobin molecule consists of: A Porphyrin ring with a molecule of Fe in the center B A polypeptide chain containing Fe C A pyrole ring with four molecules of Fe in the center D Four porphyrin rings, each containing a molecule of Fe in the center 💡 Explanation The heme portion of the hemoglobin molecule consists of: ✓ Correct Answer: D. Four porphyrin rings, each containing a molecule of Fe in the center