Which of the following is consistent with the endosymbiotic origin of mitochondria?
AThey have a single membrane and no organellar DNA at all
BThey have circular DNA, 70S ribosomes, divide by fission
CThey are synthesised only by the Golgi apparatus de novo
DThey are absent from all animal cells without exception
Answer & Solution
Correct answer: B. They have circular DNA, 70S ribosomes, divide by fission
Mitochondrial circular DNA, 70S ribosomes, and binary-fission division all support the endosymbiotic theory (Margulis): mitochondria are descendants of free-living aerobic bacteria engulfed by an ancestral eukaryote.
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