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Examples of operon regulation: lac operon

The lac operon enables the breakdown of lactose.

Lactose is not continuously present in the cell so these genes are not expressed by default.

The lac operon represents an inducible system: gene expression is only switched on if there is lactose in the cell.

Lactose is broken down to glucose and galactose. This is controlled by the lac operon.
Lactose is broken down to glucose and galactose. This is controlled by the lac operon.