Practice question

Monocistronic messenger RNA carries information encoding single polypeptide species. Typical architecture includes 5' cap, leader, sole open reading frame, and polyA tail. Translation by scanning ribosome initiates at first optimal AUG and terminates at single stop codon producing one protein type, though post-translational processing may generate variants. Eukaryotic genomes almost exclusively monocistronic, each mRNA independently regulated, whereas bacterial monocistronic transcripts exist alongside polycistronic operons. This organization allows modular control through distinct promoters, enhancers, splicing, and export ensuring precise expression timing without coordinating multiple proteins from same RNA molecule.