MCQ
Which of the following is not a coenzyme?
  • A
    $\text{NAD}$
  • B
    $\text{NADP}$
  • C
    $\text{FAD}$
  • $\text{ATP}$

Answer

Correct option: D.
$\text{ATP}$
Many enzymes consists of a protein and non$-$protein component, they are called as holoenzymes. The protein component of a holoenzyme is called as apoenzyme and the non$-$protein component may be inorganic ions such as $\mathrm{Mg}^{2+}$ and $\mathrm{Mn}^{2+}$. They are tightly attached to apoenzyme, they are called as activators. The non-protein components may be organic substances such as $\mathrm{NAD}^{+}, \mathrm{NADP}^{+}$and $\mathrm{FAD}^{+}$. They are loosely attached to the apoenzyme. They are called coenzyme or cofactors.

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