Which statement about DNA is true?

Which statement about DNA is true?

• A. A single-stranded molecule composed of amino acids
• B. A double-stranded chain made up of nucleotides
• C. A protein that stores genetic information
• D. An RNA molecule that stores genetic information

Answer: (B)

DNA stores genetic information in the sequence of nucleotides and is typically a double-stranded molecule. Each nucleotide has a sugar (deoxyribose), a phosphate group, and a nitrogenous base. The two strands run in opposite directions and pair specifically (A with T, C with G) to form a stable double helix. This structure enables accurate replication and transmission of hereditary information. The statement that DNA is a double-stranded chain made up of nucleotides is correct because it reflects both its chemical building blocks and its organized, two-stranded form. The other options mix up what DNA is: amino acids form proteins, not DNA; DNA is not a protein; and while RNA can carry genetic information in some contexts, DNA is the primary genetic material in most organisms.

DNA stores genetic information in the sequence of nucleotides and is typically a double-stranded molecule. Each nucleotide has a sugar (deoxyribose), a phosphate group, and a nitrogenous base. The two strands run in opposite directions and pair specifically (A with T, C with G) to form a stable double helix. This structure enables accurate replication and transmission of hereditary information. The statement that DNA is a double-stranded chain made up of nucleotides is correct because it reflects both its chemical building blocks and its organized, two-stranded form. The other options mix up what DNA is: amino acids form proteins, not DNA; DNA is not a protein; and while RNA can carry genetic information in some contexts, DNA is the primary genetic material in most organisms.