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Which gene in the lac operon codes for the enzyme that break down lactose?

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Answer:

Gen lac z: codifies the enzyme β-galactosidase, that hydrolyzes lactose in glucose and galactose.

The other two structural genes are lacy, which is a permease that helps to transfer lactose into the cell. Finally, lacA is a trans-acetylase.

Also, the operon counts with a promoter, that is the region recognized by the RNA polymerase. An Operator region, that is recognized by the LacI repressor, and the repressor gen lacL.

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