Mitochondria, bacterial origin

Whatever the explanation of the stem eukaryote, the eukaryote organelles, both mitochondria and chloroplasts, are best explained as symbiont bacteria. Explanations of the mitochondrial symbiosis mostly invoke an early Archean stem that incorporated a bacterial symbiont. One explanation of the mitochondrion is that the origin of the mitochondrion was simultaneous with the origin of the eukaryote nucleus (Grey et al, 1999). In the hydrogen hypothesis (Martin and Muller, 1998), the symbiosis is seen as the end product of a tight physical association between anaerobic... 

---