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22 March, 05:23

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.

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  1. 22 March, 05:38
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    B

    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.
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