Heme in haemoglobin is____________?
Correct answer: D. Protoporophyrin IX
- A. Between Helix C and D
- B. Surrounded by non polar environment
- C. Bonded to E7 histidine
- D. Protoporophyrin IX
Explanation
The heme group of hemoglobin is protoporphyrin IX containing Fe2+. It is held by the proximal histidine, F8, while E7 is the distal histidine and does not directly bond the heme iron.
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