Refer to the figure, which shows the phylogenetic tree of major groups of living organisms. Based on the figure, which statement about the endosymbiotic origin of eukaryotic mitochondria is true?
A) Mitochondria are derived from endosymbiotic bacteria.
B) The common ancestor of Archaea and Eukarya possessed mitochondria.
C) Some prokaryotic archaea possess mitochondria.
D) Mammals possess chloroplasts, which become functional during starvation.
E) Bacteria is more closely related to Eukarya than to Archaea.

Question

Refer to the figure, which shows the phylogenetic tree of major groups of living organisms.  Based on the figure, which statement about the endosymbiotic origin of eukaryotic mitochondria is true?
A) Mitochondria are derived from endosymbiotic bacteria. 
B) The common ancestor of Archaea and Eukarya possessed mitochondria. 
C) Some prokaryotic archaea possess mitochondria. 
D) Mammals possess chloroplasts, which become functional during starvation. 
E) Bacteria is more closely related to Eukarya than to Archaea.

Quizplus · Accepted Answer

The figure shows that mitochondria are derived from endosymbiotic bacteria, specifically from the group of bacteria called alpha-proteobacteria. This is supported by molecular and genetic evidence.

Refer to the Figure, Which Shows the Phylogenetic Tree of Major