The endosymbiotic theory argues that prokaryotic cells became some of the organelles of early eukaryotic cells. Which of the following supports this theory?
A) Mitochondria and chloroplasts are similar to bacteria in size and structure.
B) Mitochondria and chloroplasts have their own DNA.
C) The DNA of mitochondria and chloroplasts is a circular loop like that of prokaryotes.
D) The ribosomes of mitochondria and chloroplasts resemble those of prokaryotes.
E) All the answers support the endosymbiotic theory.

Question

Quizplus · Accepted Answer

All of the choices support the endosymbiotic theory. The similarities in size and structure, possession of their own DNA, circular DNA structure, and similarities in ribosomes to prokaryotes all point towards mitochondria and chloroplasts having evolved from early prokaryotic cells that were taken up by eukaryotic cells through endosymbiosis.

The Endosymbiotic Theory Argues That Prokaryotic Cells Became Some of the Organelles