The molecule containing nitrogen base sequences that code for proteins is which biomolecule?

• A. RNA
• B. DNA
• C. Protein
• D. Carbohydrates

Answer: (B)

The information that determines which proteins to make is stored in DNA. DNA contains sequences of nitrogenous bases that encode the instructions for amino acid order in proteins. These genetic instructions are first transcribed into messenger RNA, which then guides the ribosome to synthesize the protein. RNA participates in reading and executing the code, but the actual coding sequences are housed in DNA, making it the molecule that contains the information to be translated into proteins. RNA can also code for proteins in some contexts, but the stored genetic code resides in DNA. Proteins themselves are the products, not the information carrier, and carbohydrates do not carry coding information for proteins.