Q: When lactose is present in the cell, what allows the lac genes to be expressed?


Read this paragraph and choose the correct option from the provided answers:

When lactose is present, the repressor protein does not bind to the operator. This allows RNA polymerase to bind to the promoter and begin transcription. As a result, the lac genes are expressed, and lactose is digested.

 Choices:

- concentration of repressor protein

- binding of expressor protein

- the addition of water

- nonbinding of repressor protein


A:
nonbinding of repressor protein