To have one trait possessed by complex cells - membrane-bound DNA - could be a coincidence. To have two seems unlikely. What's more, most members of the larger group that G. obscuriglobus belongs to ... have proteins that are very similar to those that control endocytosis in eukaryotes. The big question is whether this is a case of parallel evolution, or whether complex cells and bacteria shared a common ancestor capable of endocytosis.
If there is a common ancestor, the implications are huge. It means the shared ancestor, known as the last universal common ancestor, or LUCA, must have been much more complex than previously assumed. ... This would turn our picture of how life evolved on its head.
Rather than being "primitive" cells, modern bacteria may be streamlined, simplified versions of a more complex ancestor. Perhaps they are not so much prokaryote as "post-karyote."
Labels: Grand Blueprint
Polistra was named after the original townsite of Manhattan (the one in Kansas). When I was growing up in Manhattan, I spent a lot of time exploring by foot, bike, and car. I discovered the ruins of an old mill along Wildcat Creek, and decided (inaccurately) that it was the remains of the original site of Polistra. Accurate or not, I've always liked the name, with its echoes of Poland (an under-appreciated friend of freedom) and stars. ==== The title icon is explained here. ==== Switchover: This 2007 entry marks a sharp change in worldview from neocon to pure populist. ===== The long illustrated story of Polistra's Dream is a time-travel fable, attempting to answer the dangerous revision of New Deal history propagated by Amity Shlaes. The Dream has 8 episodes, linked in a chain from the first. This entry explains the Shlaes connection.