Archaeal and bacterial mRNA often serve as templates for several different proteins to be co- transcribed, however eukaryotic mRNA that makes only a single protein are

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Eukaryotic mRNA that make only a single protein are called monocistronic. This means that the mRNA has only one open reading frame (ORF) which encodes for a single protein. In contrast, archaeal and bacterial mRNA can be polycistronic, meaning the mRNA template can encode for multiple proteins through multiple ORFs.

Archaeal and Bacterial MRNA Often Serve as Templates for Several