Unlike the clear bacterial origin of the mitochondria and chloroplast, it turns out that no single existing model has received broad acceptance to explain the existence of the nucleus. Scientists have speculated that it could have arisen from an endosymbiotic event between an archaeon and a bacterium (though who engulfed whom is also uncertain). Some have proposed that an autonomous internal gathering of cell membrane as in Planctomycetes formed the eventual independent nuclear organelle, and yet others have even suggested infection by an enveloped virus as playing a role...
Posted on: Mon, 14 Apr 2014 18:30:00 +0000
Trending Topics
Recently Viewed Topics
© 2015