The evolutionary ancestors of mitochondria are believed to have been ancient ____.
A) Archaea
B) cyanobacteria
C) proteobacteria
D) green bacteria
E) Gram-positive bacteria

Question

Quizplus · Accepted Answer

Mitochondria are believed to have originated from an endosymbiotic event involving an ancestral eukaryotic cell and a proteobacteria. This theory is supported by the similarity between mitochondria and proteobacteria in terms of their DNA, ribosomes, and double-membrane structure.

The Evolutionary Ancestors of Mitochondria Are Believed to Have Been