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| Q. |
Magnesium is a constituent metal of – |
| A. | Chlorophyll molecule |
| B. | DNA |
| C. | Mitochondria |
| D. | Ribosomes |
| Answer» A. Chlorophyll molecule | |
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Explanation: The basic structure of chlorophyll consists of a porphyrin ring, coordinated to a central atom. This is very similar in structure to the heme group found in hemoglobin, except that in heme the central atom is iron, whereas in chlorophyll it is magnesium. This was discovered in 1906 and was the first time that magnesium had been detected in living tissue. |
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