Question
Which one is the cofactor of carbonic anhydrase?
Iron (Fe)
Zinc (Zn)
Copper (Cu)
Magnesium (Mg)
Solution
B.
Zinc (Zn)
Many enzymes require the presence of an additional, nonprotein, cofactor. Some of these are metal ions such as Zn2+ (the cofactor for carbonic anhydrase), Cu2+, Mn2+, K+ and Na+. Some cofactors are small organic molecules called coenzymes. The vitamin-B are the precursors of coenzyme.
