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Lac operonplugin-autotooltip__default plugin-autotooltip_bigOperon: two or more genes that are transcribed together on an mRNA from a single promoter. Most commonly seen in bacteria; very rare in eukaryotes.: an operonplugin-autotooltip__default plugin-autotooltip_bigOperon: two or more genes that are transcribed together on an mRNA from a single promoter. Most commonly seen in bacteria; very rare in eukaryotes. in E. coliplugin-autotooltip__default plugin-autotooltip_bigEscherichia coli: an enteric bacterium used both as a model organism and as a utility organism in genetics research. E. coli is commonly used to host various cloning vectors, such as plasmids, cosmids, F factors, and bacterial artificiak chromosomes (BACs). that contains the cis-acting regulatory elementsplugin-autotooltip__default plugin-autotooltip_bigCis-acting regulatory element: a DNA sequence that is usually located near and controls the expression of a gene or genes. Includes elements such as enhancers (e.g., $UAS_{GAL}$), repressors (e.g., $URS_{GAL}$), operators (e.g., $lacO$), promoters (e.g., the $GAL4$ promoter that contains the TATA box; another example is $lacP$ in E. coli), etc. $lacP4 $lacO$ and the protein coding genes $lacZ$, $lacY$, and $lacA$.