Which of these observations fails to support the endosymbiotic theory for the or

Question

Which of these observations fails to support the endosymbiotic theory for the origin of eukaryotic cells?

A)The existence of structural and molecular differences between the plasma membranes of prokaryotes and
the internal membranes of mitochondria and chloroplasts
B)The existence of size differences between the cytosolic ribosomes of eukaryotes and the ribosomes within
mitochondria and chloroplasts
C) the existence of size differences between some prokaryotic cells and mitochondria
D) the existence of rRNA sequence differences between the cytosolic ribosomes of eukaryotes and the
ribosomes within mitochondria and chloroplasts

I need help to breakdown this one, the answer key says A, but I do not understand the choices. Thank you!

Explanation / Answer

"The existence of structural and molecular DIFFERENCES between the plasma membranes of prokaryotes and the internal membranes of mitochondria and chloroplasts" fails to support the theory because the Edonsymbiotic theory is the belief that certain organelles originated as free-living bacteria that were taken inside another cell as endosymbionts. So if Mitochondria (for example) was initially a bacteria, then the inside membrane should have been very SIMILAR to those of prokaryotes. The rest of the other options show how Mitochondria and Prokaryotes are similar.

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