The endosymbiont hypothesis proposes all of the following EXCEPT

A. chloroplasts originated when a nucleated cell engulfed a cyanobacterium.
B. prokaryotes evolved when an aerobic bacterium engulfed a cyanobacterium.
C. a nucleated cell engulfed an aerobic bacterium which evolved into mitochondria.
D. mitochondria and chloroplasts were once free-living bacteria.


Answer: B

Biology & Microbiology

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