The exterior arrangement similar to bacterial cell walls is not an evidence in favors of the endosymbiotic theory. Endosymbiotic theory States that organelles such as chloroplasts and mitochondria were once free-living prokaryotes which eventually lived symbiotically within larger cells, forming modern day eukaryotes.
In addition to the lack of histones, mitochondria and chloroplasts have circular, single stranded DNA. Single stranded, circular DNA is found exclusively in prokaryotes. This evidence supports the endosymbiosis theory because these characteristics would allow the mitochondria and chloroplasts to survive on their own. Evidences that support endosymbiotic theory are presence of DNA, size of ribosomes, Inhibition by antibiotics, evolutionary relationship.
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