Ключевые слова: acid, atom, atomic, base, biochemistry, biology, biotechnology, bond, chemical, chemistry, composition, compound, cyclic, data, dna, education, element, formula, genes, genetic, guanine, hand, health, hold, hydrogen, information, laboratory, line, link, medicine, metabolism, molecular, molecule, nitrogen, nitrogenous, nucleotide, organic, pharmacology, pharmacy, purine, replication, ring, rna, science, skeletal, structural, structure, substance, synthesis, vital,