<prompt> Carbonic anhydrase is an example of:LipoproteinPhosphoproteinMetalloproteinChromoprotein  <response>: Metalloenzymes: These enzymes hold the metals rather tightly which are not readily exchanged. e.g., alcohol dehydrogenase, carbonic anhydrase, alkaline phosphatase, carboxypeptidase and aldolase contain zinc.Phenol oxidase copperPyruvate oxidase manganeseXanthine oxidase molybdenumCytochrome oxidase iron and copperKey Concept:Metalloproteins: They contain metal ions. Examples are Hemoglobin Iron, Cytochrome Iron, Tyrosinase Copper and Carbonic anhydrase Zinc.Ref : Textbook of Biochemistry, Satyanarayana 