The name of the macromolecule that codes for proteins is deoxyribonucleic acid (DNA). DNA is composed of long chains of nucleotides, which contain genetic information essential for the development, functioning, and reproduction of living organisms. Each gene within DNA provides the instructions for synthesizing specific proteins, which play crucial roles in countless biological processes. The sequence of nucleotides in DNA ultimately determines the structure and function of proteins, highlighting DNA's fundamental importance in biology and genetics.