The strongest evidence for the endosymbiotic origin of eukaryotic organelles is the similarity between extant prokaryotes and which of the following?
A)nuclei and chloroplasts
B)mitochondria and chloroplasts
C)cilia and mitochondria
D)mitochondria and nuclei
E)mitochondria and cilia

Question

Quizplus · Accepted Answer

The endosymbiotic theory proposes that eukaryotic organelles such as mitochondria and chloroplasts originated from free-living prokaryotes that were engulfed by ancestral eukaryotic cells. The strongest evidence for this theory is the similarity between extant prokaryotes and mitochondria and chloroplasts. Both organelles have their own DNA and ribosomes, and their genetic sequence is similar to those of free-living bacteria. The other choices (A, C, D, E) are not supported by as much evidence as the similarity between prokaryotes and mitochondria/chloroplasts.

The Strongest Evidence for the Endosymbiotic Origin of Eukaryotic Organelles