The heme group of hemoglobin differs from the porphyrin of chlorophyll in having:
Correct answer: A. Iron as central atom
- A. Iron as central atom
- B. Magnesium as central atom
- C. Four pyrrole rings
- D. Central atom coordinated with nitrogen of each pyrrole ring
Explanation
The haem group of hemoglobin is characterized by having iron as its central metal atom. In contrast, the porphyrin of chlorophyll has magnesium as its central atom. This distinction is crucial in differentiating the two compounds. While both structures feature four pyrrole rings and have their central atom coordinated with the nitrogen of each pyrrole ring, it is the type of metal atom that sets them apart.
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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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_ of hemoglobin is also a porphyrin ring.
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