_ of hemoglobin is also a porphyrin ring.
Correct answer: C. Haem group
- A. α - chain
- B. β - chain
- C. Haem group
- D. Protein
Explanation
The correct answer is the heam group. Hemoglobin is composed of protein chains and a non-protein component, the haem group, which contains a porphyrin ring. This ring is central to the function of hemoglobin, as it binds iron ions that facilitate oxygen transport. The α and β chains are protein subunits and do not contain the porphyrin ring. The term 'protein' is too broad and does not specifically identify the part of hemoglobin that includes the porphyrin structure.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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