In eukaryotic cells, RNA polymerases cannot directly detect and bind to the promoter region - they require the binding of _____.

In eukaryotic cells, RNA polymerases cannot directly detect and bind to the promoter region - they require the binding of _____.

• A. Enhancers
• B. Promoters
• C. RNA polymerase
• D. Transcription factors

Answer: (D)

In eukaryotes, RNA polymerase II can’t bind to promoter DNA on its own. It relies on transcription factors to recognize promoter elements and assemble a preinitiation complex that recruits and positions the polymerase at the start site. These transcription factors (including general transcription factors that bind the promoter) effectively bridge the polymerase to the DNA and help open the DNA for transcription. Enhancers play a regulatory role by binding factors that boost transcription via looping to the promoter, but they are not what directly recruits RNA polymerase to the promoter. The promoter itself is the DNA region that needs these transcription factors to bring in the polymerase; without them, RNA polymerase cannot bind effectively.

In eukaryotes, RNA polymerase II can’t bind to promoter DNA on its own. It relies on transcription factors to recognize promoter elements and assemble a preinitiation complex that recruits and positions the polymerase at the start site. These transcription factors (including general transcription factors that bind the promoter) effectively bridge the polymerase to the DNA and help open the DNA for transcription. Enhancers play a regulatory role by binding factors that boost transcription via looping to the promoter, but they are not what directly recruits RNA polymerase to the promoter. The promoter itself is the DNA region that needs these transcription factors to bring in the polymerase; without them, RNA polymerase cannot bind effectively.