1.

Vitamin B12 deficiency causes pernicious Anemia. Animals cannot synthesize vitamin B12. Humans must obtain all their vitaminB12 from their diet. The complexing metal ion in vitamin B12 is:

A. Mg2+ (Magnesium ion)
B. Fe2+ (Iron ion)
C. Co3+ (Cobalt ion)
D. Zn2+ (Zinc ion)
Answer» D. Zn2+ (Zinc ion)


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