Zinc Function: DNA and RNA Synthesis

Zinc plays a crucial role in the human body, primarily acting as a cofactor for numerous enzymes involved in essential metabolic processes. Its major function relates directly to genetic material.

Major Role of Zinc

• DNA and RNA Synthesis: Zinc is indispensable for the synthesis and repair of DNA and RNA. It is a component of enzymes like DNA polymerase and RNA polymerase, which are vital for nucleic acid metabolism.
• Enzyme Activity: It serves as a structural component or catalytic cofactor for over 300 enzymes involved in protein synthesis, cell division, and carbohydrate metabolism.
• Immune Function: Zinc supports immune system development and function.
• Cell Division: It is essential for cell growth and division.

Analysis of Options

• Haemoglobin synthesis: Primarily involves iron, not zinc.
• DNA and RNA synthesis: This is a major function of zinc, as it's critical for the enzymes involved.
• Bone health: While zinc contributes to overall growth and development, which impacts bones, it's not its primary function compared to nucleic acid synthesis. Calcium and Vitamin D are more directly linked.
• Vision: Vitamin A is the key nutrient for vision; zinc plays a role in transporting Vitamin A but isn't the primary factor for the process itself.

Therefore, the most significant function of zinc among the choices provided is its role in DNA and RNA synthesis.