Endosymbiotic Theory: What Happened to Membrane-Bound Organelles?

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The discussion centers on the fate of membrane-bound organelles in eukaryotes that underwent secondary endosymbiosis, specifically those that engulfed prokaryotes. It highlights the uncertainty surrounding the identification of these cells, which are only known through molecular evidence. The conversation references Lynn Margulis's endosymbiotic theory, suggesting that pre-eukaryotes may have possessed internal membranes, although these structures remain unobserved.

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Thejas15101998
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What happened to the membrane bound organelles that were present in the eukaryote that gulped the primary endosymbiont (that is, the eukaryote that gulped a prokaryote), after the secondary endosymbiosis.
 
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Its not clear these cells were, but here is a recent thread about some which might have been a close relative to it.
These cells are only known from their molecules, they have not been identified and details of their structure are not yet known.
There is speculation that these pre-eukaryotes may have already had some internal membranes, but they have not yet been seen.
 
This is the endosymbiotic theory by Lynn Margulis.
 

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