Consider the following statements:
$\left(\mathrm{A}\right)$ Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.
$\left(\mathrm{B}\right)$ A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.
Select the correct option.

Many enzymes show catalytic activity only in association with certain non-protein substances. Those substances are known as cofactors (cofactors may be simple metal ions, e.g. Mg⁺⁺ or K⁺ etc.). The enzymes which works only in presence of cofactors are called  apoenzymes. An organic non-protein cofactor which is easily separable from the apoenzyme is called coenzyme, and the non-protein organic cofactor that is tightly bound to and non-dissociable from the enzyme is termed as prosthetic group, e.g. biotin of carboxylases, haem of hemoglobin, etc.