Which of the following minerals plays an important role in DNA, RNA, and protein production?

Zinc plays a crucial role in the synthesis of DNA and RNA due to its involvement as a cofactor in various enzymatic reactions necessary for nucleic acid metabolism. It is essential for the function of several enzymes, including DNA polymerases, which are responsible for DNA replication and repair. Additionally, zinc is vital for protein synthesis as it influences the structure and function of ribosomes and is important for the activity of RNA polymerases, which facilitate the transcription process.

While iodine is primarily known for its role in thyroid hormone production, and sulfur is significant for amino acid structure and function, neither has a direct role in the DNA, RNA, and protein synthesis processes as integral as zinc. Cobalt is essential for vitamin B12 and impacts red blood cell production rather than directly influencing nucleic acids or proteins. Thus, zinc stands out as the mineral most directly linked to the production of DNA, RNA, and proteins.