The lac operon. In the absence of lactose, the repressor protein encoded by the I gene binds to the lac operator and prevents transcription. Binding of allolactose to the repressor causes it to leave the operator. This enables RNA polymerase to transcribe the three genes of the operon.n the absence of lactose, the repressor protein encoded by the I gene binds to the lac operator and prevents transcription. Binding of allolactose to the repressor causes it to leave the operator.
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Select Software Category. NCH Software has developed a number of professional music recording software for Windows or Mac available for free to download. Each program is specifically designed for particular recording tasks including general audio recording, music mixing, editing and more.