Transcriptional Regulatory Proteins in Eukaryotic Cells Can Influence the Initiation

Transcriptional regulatory proteins in eukaryotic cells can influence the initiation of transcription by affecting the stability or assembly of the basal transcription apparatus. Some regulatory proteins are activators and stimulate transcription; others are repressors and inhibit initiation of transcription.
-Most transcriptional activator proteins affect transcription by interacting with

A) introns.
B) the basal transcription apparatus.
C) DNA polymerase.
D) nucleosomes.