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enzyme a protein that controls a reaction in a cell promoter DNA

sequence to which RNA polymerase binds to begin transcription archaeans members of one of three domains of life, have types of cells without a nucleus eukaryotes organisms with cells possessing a nucleus eubacteria one of three domains of life, comprising most groups previously

Transcription Factors

Transcription factors are protein complexes that help RNA polymerase bind to DNA. RNA polymerase is the enzyme that transcribes genes to make messenger RNA, which is then used to make protein. By controlling RNA polymerase's access to the gene, transcription factors control the rate at which a gene is transcribed. Without transcription factors, cells would not be able to effectively regulate the rate at which genes are expressed.

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