A) Iron (Fe)
B) Zinc (Zn)
C) Copper (Cu)
D) Magnesium (Mg)
Correct Answer: B
Solution :
Many enzymes require the presence of an additional, non - protein, cofactor. Some of these are metal ions such as \[Z{{n}^{2+}}\] (the cofactor for carbonic anhydrase), \[C{{u}^{2+}},\text{ }M{{n}^{2+}},\text{ }{{K}^{+}}\]and \[N{{a}^{+}}.\] Some cofactors are small organic molecules called coenzymes. The vitamin - B are the precursors of coenzyme.
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