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structural gene - a gene that controls the production of a specific protein or peptide. suppresser gene, suppressor gene, suppresser, suppressor - a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene)
Rating Newest Oldest. Best Answer: The lac operon consists of three adjacent structural genes, a promoter, a terminator, and an operator. The three structural genes are:: lacZ, lacY, and lacA. lacZ encodes Î²-galactosidase (LacZ), an intracellular enzyme that cleaves the disaccharide lactose into glucose and galactose. lacY encodes Î²-galactoside permease (LacY), a membrane bound transport protein that pumps lactose into the cell. lacA encodes Î²-galactoside transacetylase (LacA), an enzyme that transfers an acetyl group from acetyl-CoA to Î²-galactosides.