Practice question

Eukaryotic nuclear genes generally transcribed as monocistronic units containing single open reading frame per pre-messenger RNA. After 5' capping, splicing, and polyadenylation, mature mRNA exported to cytoplasm translates into single polypeptide. Separate promoters, enhancers, chromatin remodeling regulate each gene independently, allowing tissue-specific expression and alternative splicing diversity not feasible with polycistronic organization. Though few exceptions exist in nematodes and trypanosomes where trans-splicing generates monocistronic products from polycistronic precursors, predominant pattern remains one gene-one transcript, reflecting complexity of eukaryotic gene regulation and nuclear-cytoplasmic separation.