guanine hexnut, g. purine nucleobase molecule. present in dna. 3d on white background

acid ancestry background bio biochemistry biology bond bonding carbon cell chromosome copy cytoplasm deoxyribonucleic dna double educational formula gene genealogical genealogy genetics genome guanine helical helix heredity hexnut hydrogen identical identify illustration information medical model molecule nitrogen nucleic nucleotide nucleotides nucleus oxygen pair phosphorus purine replication science structure telomere test vector white