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Merry Youle

I, too, find the term "prokaryote" useful despite the exceptions. It would be easier to justify this usage, however, if we could point to at least one difference between prokaryote and eukaryote that is inviolate (at least so far). In the archetypal prokaryote, translation and transcription are closely coupled in that the ribosomes and the rest of the protein synthesizing machinery associate with the nascent mRNA. Protein synthesis is underway even before transcription has been completed. In the typical eukaryote, transcription is nuclear and the mRNA is transported to the cytoplasm where translation takes place. Have any exceptions to this been found so far?

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