Which of the following is an example of regulation of eukaryotic transcription?

Question

Quizplus · Accepted Answer

Activator proteins binding an enhancer is a common mechanism of regulation of eukaryotic transcription. Enhancers are DNA sequences that can be located quite far from the promoter region of a gene, and activator proteins bind to the enhancers to increase the rate of transcription of that gene. This is known as enhancer-mediated transcription regulation. The other choices describe post-transcriptional regulation mechanisms. Iron binding the repressor protein for the ferritin mRNA and increasing ferritin expression is an example of translational control, where the availability of a specific protein or ligand modulates gene expression. Proteostome breakdown of protein-ubiquitin complexes is important in protein turnover and degradation, but it is not a regulatory mechanism of eukaryotic transcription. MicroRNAs binding their target mRNA and causing its degradation is an example of post-transcriptional regulation of gene expression. Alternate splicing of an mRNA transcript is also a post-transcriptional regulatory mechanism because it affects the processing and stability of mRNA.

Which of the Following Is an Example of Regulation of Eukaryotic