What is the primary function of DNA within a cell?

What is the primary function of DNA within a cell?

• A. Store energy for cellular processes
• B. Provide the genetic instructions for making proteins
• C. Catalyze chemical reactions
• D. Transport nutrients

Answer: (B)

DNA's primary function in a cell is to store genetic information and provide the instructions for building proteins. The sequence of DNA carries genes, which are transcribed into RNA and then translated into proteins. These proteins carry out most cellular tasks, from structural roles to catalysis and signaling, making DNA the blueprint for how the cell functions and passes traits to offspring. Other options describe roles of different molecules: energy storage is mainly handled by ATP, not DNA; catalysis is performed by enzymes (proteins) or some RNA molecules; transport of nutrients is accomplished by transport proteins and membranes, not by DNA itself. So this function best captures why DNA is essential: it encodes the information that directs protein production.

DNA's primary function in a cell is to store genetic information and provide the instructions for building proteins. The sequence of DNA carries genes, which are transcribed into RNA and then translated into proteins. These proteins carry out most cellular tasks, from structural roles to catalysis and signaling, making DNA the blueprint for how the cell functions and passes traits to offspring.

Other options describe roles of different molecules: energy storage is mainly handled by ATP, not DNA; catalysis is performed by enzymes (proteins) or some RNA molecules; transport of nutrients is accomplished by transport proteins and membranes, not by DNA itself. So this function best captures why DNA is essential: it encodes the information that directs protein production.