Ключевые слова: acid, adenine, atom, base, biochemistry, biology, chemical, chemistry, cytosine, dna, element, formula, gene, guanine, helix, illustration, isolated, lab, laboratory, medicine, model, molecular, molecule, molecules, nitrogen, nucleobase, nucleotide, organic, pharmacy, purine, research, rna, science, structural, structure, substance, synthesis, thymine,