Which molecules store cellular information and are polymers of nucleotides?

• A. DNA and RNA
• B. Proteins
• C. Carbohydrates
• D. Lipids

Answer: (A)

Nucleic acids store cellular information and are polymers of nucleotides. DNA holds the genetic blueprint in the sequence of deoxyribonucleotides, designed to be copied and transmitted with high fidelity. RNA is built from ribonucleotides and carries or acts on the information in various ways, such as mRNA conveying code from DNA to the protein-making machinery, and tRNA and rRNA participating directly in translation. These polymers are defined by their nucleotide units and their role in information storage and transfer.

Proteins are polymers of amino acids and perform most cellular functions rather than storing genetic information. Carbohydrates and lipids have other primary roles, such as energy storage and membrane structure, and are not polymers of nucleotides.