The endosymbiotic theory says that precursor eukaryotic cells acquired mitochondria by endosymbiosis with a _____ ancestor, and others gained photosynthetic ability from endosymbiosis with a _____ ancestor.
A)protozoan, algae
B)archaea, cyanobacteria
C)rickettsial, cyanobacteria
D)helminth, algae
E)None of the choices are correct.

Question

Quizplus · Accepted Answer

The endosymbiotic theory suggests that some precursor eukaryotic cells acquired mitochondria via endosymbiosis with a rickettsial ancestor, while others gained photosynthetic ability by endosymbiosis with a cyanobacteria ancestor. Therefore, option C (rickettsial, cyanobacteria) is the correct answer.

The Endosymbiotic Theory Says That Precursor Eukaryotic Cells Acquired Mitochondria