Which one of these is a metal containing Vitamin?
Which one of these is a metal containing Vitamin?
Select an option to attempt
Correct Answer: Option C
Explanation
Metal-containing vitamin:• Vitamin B12 (Cobalamin) is the only vitamin that contains a metal ion as an integral, essential structural component.• The metal is cobalt () at the centre of a corrin ring (similar to haem's porphyrin ring).• The corrin ring coordinates cobalt, and the upper ligand can be a methyl group (methylcobalamin) or adenosyl group (adenosylcobalamin), both active forms.• Cobalamin is essential for methionine synthase (methylation of homocysteine) and methylmalonyl-CoA mutase (propionyl-CoA catabolism).Other vitamins:• Vitamin C: ascorbic acid, no metal• Vitamin B1 (Thiamine): thiazole+pyrimidine, no metal• Vitamin A: retinol, no metalAnswer: Vitamin B12 (Option 3).