<P> In molecular biology, an inducer is a molecule that regulates gene expression . An inducer can bind to protein repressors or activators . </P> <P> Inducers function by disabling repressors . The gene is expressed because an inducer binds to the repressor . The binding of the inducer to the repressor prevents the repressor from binding to the operator . RNA polymerase can then begin to transcribe operon genes . </P> <P> Inducers also function by binding to activators . Activators generally bind poorly to activator DNA sequences unless an inducer is present . Activator binds to an inducer and the complex binds to the activation sequence and activates target gene . Removing the inducer stops transcription . </P>

Which of the following statements describe how inducers cause changes in gene expression