One hypothesis explaining the first nucleated eukaryotic cell is based upon the fusion of an archaeon and a bacterium that,over time,saw archaeal genes involved in metabolism being lost while bacterial genes involved in information processing were also degraded.

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This is known as the endosymbiotic theory and is widely accepted as a possible explanation for the origins of eukaryotic cells.

One Hypothesis Explaining the First Nucleated Eukaryotic Cell Is Based