Which one of the following is a coenzyme?

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(D) Coenzymes are organic non-protein cofactors that bind loosely to an enzyme and are essential for its catalytic activity. Many vitamins or their de

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All the above

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(D) Coenzymes are organic non-protein cofactors that bind loosely to an enzyme and are essential for its catalytic activity. Many vitamins or their derivatives function as coenzymes. $A$. Nicotinamide is a component of $NAD^+$ and $NADP^+$,which are essential coenzymes. $B$. Riboflavin (Vitamin $B_2$) is a precursor for $FMN$ and $FAD$,which act as coenzymes. $C$. Pantothenic acid (Vitamin $B_5$) is a precursor for Coenzyme $A$ $(CoA)$. Since all the listed substances are precursors or components of essential coenzymes,the correct answer is $D$.

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