Question

In eukaryotic cells, how do transcription factors act to control gene expression?

A. They remove introns from pre-mRNA.
B. They bind to regulatory regions of DNA near the genes.
C. They insert themselves into DNA near the beginning of a gene.
D. They code for the synthesis of RNA polymerase.

Answer 1

B

Step-by-step explanation:

They can inhibit or promote RNA polymerase depending on whether it is a repressor or activator respectively. They bind in the regulatory region on DNA, therefore, this means they will have a DNA-binding domain (DBD). They can physically block the polymerase from transcription or catalyze the acetylation or deacetylation of histone proteins.