What does DNA expression do?

• A. Controls characteristics through proteins.
• B. Stores energy.
• C. Codes for lipids.
• D. Forms a protective coat around the cell.

Answer: (A)

Gene expression is the process by which information in DNA is used to make functional products, most often proteins, which carry out the work of the cell. The proteins produced through expression determine much of what a cell does and, ultimately, an organism’s traits—things like enzyme activity, structural support, signaling, and metabolism. That’s why expression controls characteristics through proteins: the proteins are the actual effectors that execute cellular functions and shape phenotype.

Energy storage isn’t a direct product of gene expression; it relies on metabolites and energy-carrying molecules like glycogen, fat, and ATP. Similarly, while many enzymes involved in lipid synthesis are proteins, DNA expression isn’t simply “coding for lipids” in a direct sense. And the protective coat around the cell is provided by the cell membrane and cell wall structures, not by DNA expression itself.