Metalloproteins are a type of conjugated protein.

• A. True
• B. False
• C. Not a type of conjugated protein
• D. Sometimes

Answer: (A)

Metalloproteins are proteins that include a metal ion as a non-protein component, tightly bound as a prosthetic group. That non-protein part is what makes them conjugated proteins—the protein and the metal-containing group work together as a single functional unit. This combination is essential for many functions, such as iron in heme enabling oxygen transport in hemoglobin or zinc aiding catalysis in carbonic anhydrase. Because the metal ion is an integral, non-protein part of the molecule, metalloproteins are always conjugated proteins, not just sometimes. So the statement is true.