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LacZ: the 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). $lacZ$ geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-) codes for the proteinplugin-autotooltip__default plugin-autotooltip_bigProtein: a molecule that is formed by the translation of messenger RNAs (mRNAs). Functions that proteins provide are what usually give organisms their phenotypes. LacZ, also known as the enzymeplugin-autotooltip__default plugin-autotooltip_bigEnzyme: a macromolecule, usually a protein (but sometimes an RNA), that functions as a catalyst of some kind of biochemical reaction. β-galactosidase; that is, it catalyzes the hydrolysis of lactose into galactose and glucose.