The center of porphyrin in the head region of hemoglobin is occupied by:
Correct answer: D. Iron
- A. Potassium
- B. Sodium
- C. Magnesium
- D. Iron
Explanation
Haemoglobin consists of four polypeptide chains. Each chain is associated with a haem group. Haeme group is an iron-containing group, which consists of porphyrin with a central atom of ferrous (iron) between four pyrrole rings.
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