In the context of the genetic code, what does DNA ultimately code for?

• A. Ribosomal subunits that directly catalyze peptide bond formation without translation
• B. The three-dimensional folding pattern of proteins independent of amino acid sequence
• C. The specific lipid composition of cellular membranes
• D. The amino acid sequence of proteins (via mRNA codons during translation)

Answer: (D)

Verified step by step guidance

1. Understand that DNA contains the genetic instructions used in the development and functioning of all living organisms.
2. Recognize that DNA sequences are transcribed into messenger RNA (mRNA) molecules, which serve as templates for protein synthesis.
3. Recall that during translation, the mRNA codons (triplets of nucleotides) are read by the ribosome to assemble amino acids in a specific order.
4. Know that the sequence of amino acids determines the primary structure of a protein, which ultimately influences its three-dimensional shape and function.
5. Conclude that DNA ultimately codes for the amino acid sequence of proteins through the intermediary of mRNA codons during translation.