structure of cell. from nucleobase like adenine to gene, dna and chromosome

adenine anatomy base biochemistry biology biotechnology cell centromere chemical chemistry chromatid chromosome compound cytosine design diagram dna education element evolution formula gene genetic genome guanine health helix human illustration medical medicine model molecular molecule mutation nitrogenous nucleobase nucleotide nucleus poster research ribonucleic rna science scientific sequence spiral structural structure thymine uracil vector