Proteins that assist the binding of RNA polymerase to a promoter are called _____________.

Proteins that assist the binding of RNA polymerase to a promoter are called _____________.

• A. Promoters
• B. Transcription factors
• C. Ribosomes
• D. Helicases

Answer: (B)

Proteins that assist RNA polymerase in finding and binding to a promoter are transcription factors. They act as initiators or facilitators of transcription by helping RNA polymerase recognize promoter DNA, assemble the transcription initiation complex, and start RNA synthesis. In bacteria, a sigma factor is a familiar example that guides RNA polymerase to promoter sequences. In eukaryotes, general transcription factors work with RNA polymerase II to recruit it to the promoter. Promoters are the DNA sequences where transcription begins, not proteins. Ribosomes synthesize proteins, not involved in initiating transcription. Helicases unwind DNA but aren’t specifically about aiding RNA polymerase binding to promoters.

Proteins that assist RNA polymerase in finding and binding to a promoter are transcription factors. They act as initiators or facilitators of transcription by helping RNA polymerase recognize promoter DNA, assemble the transcription initiation complex, and start RNA synthesis. In bacteria, a sigma factor is a familiar example that guides RNA polymerase to promoter sequences. In eukaryotes, general transcription factors work with RNA polymerase II to recruit it to the promoter. Promoters are the DNA sequences where transcription begins, not proteins. Ribosomes synthesize proteins, not involved in initiating transcription. Helicases unwind DNA but aren’t specifically about aiding RNA polymerase binding to promoters.