[Right Wing Professor]

The endosymbiotic hypothesis says that prokaryotes lived symbiotically within the ancestor of single-celled eukaryotes.

UntrueThe endosymbiotic hypothesis as it applies to evolution is an attempt to explain the origin of eukaryotic cells through prokaryote-prokaryote endocytosis, symbiosis, and organelle formation

BWAHAHAHA! So what was the ancestor of a eukaryotic cell before it incorporated organelles? Was it a eukaryote?

You also know that your link does absolutely nothing as far as proving such an origin.

Attempted disproof by repeated denial. We know that living prokaryotes invade other prokaryotic cells endoparasitically. We know they invade single celled eukaryotes endsymbiotically, and that they replace mitochondia in some protozoans. If an endosymbiotic prokaryote can and does replace the role of a mitochondrion, that doesn't suggest that the mitochondrion might have evolved from a prior endosymbiotic prokaryote?

[js1138]

Yes, but were you there? Just because you can see a process happening now doesn't mean it was happening thirty minutes ago.

[Old_Mil]

BWAHAHAHA! So what was the ancestor of a eukaryotic cell before it incorporated organelles? Was it a eukaryote?

Considering the definition of a eukaryotic cell, the answer would have to be "no". Unless it is your contention that the eukaryotic cell and its membrane bound organelles arose spontaneously at once along an evolutionary path independent of the prokaryotic bacteria. If it is your wish to try and set forth such an argument, be my guest.

We know that living prokaryotes invade other prokaryotic cells endoparasitically.

The key being endoparasitically. This sort of like comparing a home invasion robbery to a dinner party. There are a variety of intracellular pathogens, none of which get us any closer to explaining the origin of membrane bound organelles.

We know they invade single celled eukaryotes endsymbiotically, and that they replace mitochondia in some protozoans.

Again, here you deal with the pre-existence of a complex cell establishing endosymbiotic relationships and this gets us no closer to the origin of membrane bound organelles than the symbiotic relationship between a crocodile and Trochilos.

You really need to do a better job of sticking to evidence that deals with the specific point under discussion. To refresh your memory, that has to do with the evolution of eukaryotes from a single celled organism without membrane bound organelles through endocytosis that leads to symbiosis.