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(B) In the context of gene regulation,an operon is a cluster of genes under the control of a single promoter. An $Inducer$ is a small molecule that tr

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Inducer

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(B) In the context of gene regulation,an operon is a cluster of genes under the control of a single promoter. An $Inducer$ is a small molecule that triggers the transcription of an operon by binding to the repressor protein. When the $Inducer$ binds to the repressor,it changes the shape of the repressor,preventing it from binding to the operator region. This allows $RNA$ polymerase to bind to the promoter and initiate transcription. For example,in the $lac$ operon,lactose acts as the $Inducer$.

An environmental agent that triggers transcription from an operon is a:

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