Which macromolecule primarily stores genetic information in cells?

• A. RNA
• B. Deoxyribonucleic acid (DNA) stores hereditary information.
• C. Protein
• D. Lipids

Answer: (B)

DNA, deoxyribonucleic acid, stores genetic information in cells. The sequence of nucleotides encodes the hereditary instructions that determine traits and guide development. Its stable, double-stranded structure with complementary base pairing makes it well suited for accurate replication and long-term storage across generations. When used, this information is transcribed into RNA and then translated into proteins. RNA can carry genetic information in some viruses and has functional roles in the cell, but it is generally less stable and not the primary long-term storage form in cellular life. Proteins do not store genetic information; they are the functional products encoded by DNA. Lipids store energy and form membranes, not genetic instructions.