Tuesday, October 28, 2014

Everything You Think You Know About Endosymbiosis is Wrong! (Maybe)

One of the reasons I've been MIA lately is that I'm tutoring several students in biochemistry and cell biology.  I recently finished explaining the theory of endosymbiosis to one of my students.  That's the theory that explains the origin of eukaryotic cells - that is, mitochondria and chloroplasts, and possibly other organelles, represent formerly free-living prokaryotes that were ingested in another cell.  It is supported by the fact that these organelles are double-membraned, have their own DNA, and can replicate independently of the rest of the cell.  But now, a new open access meta-analysis has decided to shake this all up, stating that the origin of eukaryotic cells happened from the inside-out.