The function of the promoter is to signal the RNA polymerase:

Name: The function of the promoter is to signal the RNA polymerase:
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The promoter is a specific sequence of DNA that signals to the RNA polymerase where to start transcribing the DNA. This is important because without the promoter, RNA polymerase would not know which strand of DNA to transcribe or where to start transcription. The promoter acts like a switch that turns on the transcription machinery at the correct location on the DNA.

The Function of the Promoter Is to Signal the RNA