This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transcription, Subject name: Biochemistry
[{'content': 'At which of the following levels the predominant regulation of gene expression of both prokaryotes and eukaryotes take place? \nSelect and explain. \nA. DNA replication, B. Transcription, C. Translation, D. Post-translational', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Expression of a functional gene product from genes is the gene expression. The functional product is not always proteins. Non-protein coding genes are also expressed as functional RNAs (tRNA, snRNA, miRNA etc.) Regulation of gene expression occurs at transcriptional level in both prokaryotes and eukaryotes.', 'role': 'assistant'}]