This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'A segment of a eukaryotic gene that is not represented in the mature mRNA, known as \nSelect and explain. \nA. Intron, B. Exon, C. Plasmid, D. TATA box', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The primary transcript are very long, they have molecular weights more than 10^7The primary transcript contains coding regions -extrons and non-coding regions -intronsThe introns sequence are cleaved and the exons are spliced to form mature mRNA moleculeRef: DM Vasudevan, 7th edition, page no: 591', 'role': 'assistant'}]