The last ancestor of all life was a eubacterium with acyl-ester membrane lipids, large genome, murein peptidoglycan walls, and fully developed eubacterial molecular biology and cell division. It was a non-flagellate negibacterium with two membranes, probably a photosynthetic green non-sulphur bacterium with relatively primitive secretory machinery, not a heterotrophic posibacterium with one membrane. [1]
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[1] Cavalier-Smith, Thomas. 2006. Rooting the tree of life by transition analyses. Biology Direct, 1:19 doi:10.1186/1745-6150-1-19.
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