Evidence suggests that first, ____________ were acquired when an aerobic bacterium was engulfed by larger cells and became mutually dependent and second, ____________ were acquired by the same means. Because all eukaryotic cells contain organelles, it is obvious that they were aquired before ____________ . Some additional proof of the endosymbiotic theory includes the similarity in size between bacteria and mitochondria and cyanobacteria and chloroplasts. Also, the DNA of mitochondria and chloroplasts is in a circular loop, like those of prokaryotes. Finally, mitochondria and chloroplasts have their own ____________ , which are similar in size and structure to those of prokaryotes. ribosomes chloroplasts organelles Golgi appartus viruses size mitochondria circular loop molecules