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Bacteria: Single-celled organisms that also utilize DNAplugin-autotooltip__default plugin-autotooltip_bigDNA: deoxyribonucleic acid. The genetic material for nearly all life on Earth. and the standard genetic codeplugin-autotooltip__default plugin-autotooltip_bigGenetic code: the code that matches codons with specific amino acids. Since each codon is 3 nucleotides long (i.e., the genetic code is a triplet code) and there are 4 different RNA nucleotides (G, A, U, and C), the genetic code could in theory specify up to $4^3=64$ different amino acids. But since there are only 20 different as all organisms on earth, but unlike eukaryotesplugin-autotooltip__default plugin-autotooltip_bigeukaryote: organism whose cells have membrane bound organelles, including the nucleus. do not have intracellular membranes and membrane-bound organelles.