What is the function of DNA in cells?

• A. It stores the information that directs the ribosome in protein synthesis.
• B. It stores energy for metabolic reactions.
• C. It forms the cell membrane.
• D. It acts as an enzyme.

Answer: (A)

DNA serves as the cell’s genetic blueprint, storing the instructions for making proteins and RNAs. The information is transcribed into messenger RNA, which is then read by ribosomes to assemble proteins. In this way, DNA indirectly directs protein synthesis—the ribosome uses the instructions encoded in DNA via the RNA intermediate. The other options describe functions that DNA does not perform: energy storage is handled by molecules like ATP, the cell membrane is made of lipids, and enzymes are typically proteins or RNA catalysts, not DNA.