Which of the following is not an example of evidence supporting the "endosymbiotic theory"?
Correct answer: D. Mitochondria are capable of photosynthesis
- A. Mitochondria and other plastids multiply by binary fission
- B. Mitochondria contain their own DNA, which is a single circular chromosome
- C. Mitochondria have their own ribosomes, which are 70S
- D. Mitochondria are capable of photosynthesis
Explanation
The correct answer is that mitochondria are not capable of photosynthesis. This statement does not serve as evidence for the endosymbiotic theory since photosynthesis is a function of chloroplasts, not mitochondria. The other options, binary fission, the presence of circular DNA, and 70S ribosomes, all provide strong evidence supporting the idea that mitochondria originated from free-living bacteria that were engulfed by ancestral eukaryotic cells.
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Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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