Which mineral is necessary for many enzymes and metabolizes iron, with common sources including legumes, nuts, seeds, and water?

• A. Copper
• B. Selenium
• C. Iron
• D. Zinc

Answer: (A)

This item tests how a mineral acts as a cofactor in enzyme reactions and specifically how it handles iron metabolism. Copper is essential for several enzymes, notably ceruloplasmin, which oxidizes Fe2+ to Fe3+ so iron can be transported in the bloodstream. This makes copper crucial for mobilizing and utilizing iron in the body. Copper also supports other enzymes important for energy production and antioxidant defense, and it is commonly found in foods like legumes, nuts, seeds, and even drinking water. While other minerals have important roles, copper uniquely fits the description of being necessary for many enzymes and for processing iron within the body.