Final answer:
A promoter is a DNA sequence located upstream of a gene's coding sequence. It is recognized by transcription factors and is sufficient for initiating transcription.
Step-by-step explanation:
A promoter is a DNA sequence that is located immediately upstream of the coding sequence of a gene. It is recognized by transcription factors, which are proteins that control the initiation of transcription.
The promoter is sufficient for initiating transcription by binding the transcription machinery, such as RNA polymerase, and forming the transcription initiation complex.