Genetic Regulation and the Lactose Operon

ID #1414

Would the following statement be true or false? "In the absence of lactose, no beta-galactosidase is expressed." I thought that in the absense of lactose the lac repressor protein stops beta-galactosidase from being expressed, so shouldn't this statement be true? If you could clear this up for me I would appreciate it.


Does the "dial" ever go all the way down to "zero?" Under these conditions, the least amount of beta-galactosidase possible will be made, but that doesn't mean NONE.

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