The metal, which is a constituent of vitamin B12 is____________?
Correct answer: D. Cobalt
- A. Iron
- B. Magnesium
- C. Zinc
- D. Cobalt
Explanation
Vitamin B12 contains cobalt at the centre of its corrin ring, which is why it is also called cobalamin. Iron is found in haemoglobin, not in the structure of vitamin B12.
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