Final answer:
An enhancer is a DNA sequence that promotes transcription by binding to specific transcription factors. It helps in shielding the RNA polymerase binding site of a specific gene. Enhancer regions can be located upstream, downstream, within the coding region of the gene, or even thousands of nucleotides away from the gene they control.
Step-by-step explanation:
An enhancer is a DNA sequence that promotes transcription by binding to specific transcription factors. When an enhancer is bound by transcription factors, it aids in shielding the RNA polymerase binding site of a specific gene. Enhancer regions can be located upstream, downstream, within the coding region of the gene, or even thousands of nucleotides away from the gene they control.