[Campbell Biology P.159] According to the endosymbiont theory, what type of prokaryotes are ... | Practice Question

According to the endosymbiont theory, what type of prokaryotes are proposed as the ancestors of mitochondria and chloroplasts, respectively?

  • A: Photosynthetic prokaryotes and oxygen-using nonphotosynthetic prokaryotes.
  • B: Oxygen-using nonphotosynthetic prokaryotes and photosynthetic prokaryotes.
  • C: Anaerobic prokaryotes and photosynthetic prokaryotes.
  • D: Chemosynthetic prokaryotes and oxygen-using photosynthetic prokaryotes.

Explanation

The text states: 'the proposed ancestors of mitochondria were oxygen-using nonphotosynthetic prokaryotes that were taken into host cells, while the proposed ancestors of chloroplasts were photosynthetic prokaryotes.'