I - Regulatory genes - Codes for the repressor protein that stops RNA polymerase binding to the operator region.
P - Promoter - RNA polymerase binds here to begin the transcription of the structural genes.
O - Operator - The repressor protein binds here and overlaps the promoter to prevent RNA polymerase from binding.
Z - Strucutral gene for B-Galactosidase - This is an enzyme that hydrolyses lactose into glucose and galactose.
Y - Structural gene for Lactose Permease - This enzyme transports lactose into the cell.
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