their biosynthesis is primarily determined by arrays of nucleic acid macromolecules ( dna and rna ) , and the amino acid sequences that constitute their long spatially organized peptide-chain molecules reflect at one remove this dna coding system , and thus record a step-by-step history of some of the viable genetic events ( natural or man-controlled ) that have created the organism and the breed .
C0028606
nucleic acid
C0012854
dna