5. How can we be highly confident (to the point of near certainty) that the endo
ID: 151788 • Letter: 5
Question
5. How can we be highly confident (to the point of near certainty) that the endosymbiosis of the photosynthetic bacterium that became chloroplasts occured long after the endosymbiosis of the aerobic bacterium that became mitochondria?
6. How can we be highly confident (to the point of near certainty) that bacteria and archae diverged before eukaryotes diverged from archae?
15. How could experimental data DISPROVE a theory? Give an example.
16. How could experimental data PROVE a theory? Give an example.
18. Give an example of convincing evidence that all cells alive on earth today have as a common ancestor a single cell that existed billions of years ago.
Explanation / Answer
5. All the living organims belonging to archea have in their cells mitochondria, while not all have chloroplasts.
This is the most important reason to believe that endosymbiosis of mitochondria predated that of chloroplasts.
Mitochondria are involved in the production of energy, which is the requirement of all archea organisms without exception.
On the other hand, chloroplasts are required by the organisms which can harvest energy on their own only.
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