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Did Eukaryotes evolve from Bacteria or Archaea?

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It is pretty clear that the Eucarya did not evolve from Bacteria. Eucarya and Archaea share significant homologies throughout their critical information systems: DNA replication, RNA transcription, and protein synthesis. read more

But definitely they did not evolve from Bacteria. There are too many dissimilarities to consider that path as the evolutionary direction of Eukaryotes. However, Eukaryotes possess strikingly similar characteristics towards Archaea in terms of cellular metabolism, especially the similarities in the enzymes produced by their respective biosynthetic pathways. read more

Archaea versus Bacteria comparison chart; Archaea Bacteria; Ribosomes: Present: Present: Introduction (from Wikipedia) The Archaea constitute a domain or kingdom of single-celled microorganisms. These microbes are prokaryotes, meaning that they have no cell nucleus or any other membrane-bound organelles in their cells. Bacteria constitute a large domain of prokaryotic microorganisms. read more

This works between eukaryotes, archaea and bacteria and causes the mixing of the three. An overview (originally proposed by Woese et al): Bacteria are simplest considering cellular organisation. read more

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Further Research

Archaea and Evolution
www.fossilmuseum.net

From prokaryotes to eukaryotes
evolution.berkeley.edu