Which type of cell contains transcription factors?

Which type of cell contains transcription factors?

• A. Prokaryotes
• B. Eukaryotes
• C. Both
• D. None

Answer: (B)

Transcription factors are proteins that regulate transcription by binding to specific DNA sequences and guiding RNA polymerase to the correct start site or blocking its access. In eukaryotic cells, transcription is controlled in a layered way: general transcription factors assemble with RNA polymerase II at promoters, while specific transcription factors bind enhancers and other regulatory regions to fine-tune gene expression in response to signals. This regulatory complexity—especially the need to navigate chromatin structure and long-range DNA interactions—makes transcription factors a central feature of eukaryotic gene control. While prokaryotes do have regulatory proteins as well (such as sigma factors and repressors), the broad, intricate network of transcription factors is most characteristic of eukaryotic systems. So, eukaryotic cells are the type that contain transcription factors.

Transcription factors are proteins that regulate transcription by binding to specific DNA sequences and guiding RNA polymerase to the correct start site or blocking its access. In eukaryotic cells, transcription is controlled in a layered way: general transcription factors assemble with RNA polymerase II at promoters, while specific transcription factors bind enhancers and other regulatory regions to fine-tune gene expression in response to signals. This regulatory complexity—especially the need to navigate chromatin structure and long-range DNA interactions—makes transcription factors a central feature of eukaryotic gene control. While prokaryotes do have regulatory proteins as well (such as sigma factors and repressors), the broad, intricate network of transcription factors is most characteristic of eukaryotic systems. So, eukaryotic cells are the type that contain transcription factors.