Were Gram-positive rods the first bacteria?

@article{Koch2003WereGR,
  title={Were Gram-positive rods the first bacteria?},
  author={Arthur L. Koch},
  journal={Trends in microbiology},
  year={2003},
  volume={11 4},
  pages={166-70}
}
At some point in the evolution of life, the domain Bacteria arose from prokaryotic progenitors. The cell that gave rise to the first bacterium has been given the name (among several other names) "last universal ancestor (LUA)". This cell had an extensive, well-developed suite of biochemical strategies that increased its ability to grow. The first bacterium is thought to have acquired a covering, called a sacculus or exoskeleton, that made it stress-resistant. This protected it from rupturing as… CONTINUE READING
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