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Unformatted text preview: 5. RNA first and why?: show catalytic properties (ribozymes-RNA that's able to catalyze a
-single stranded -easier to replicate
6. protobionts: structure that allows membrane allow for an internal environment different than
surroundings (like an organelle in the body) ! 7. Contributions of Photosynthetic Bacteria and Oxygen:
-photosynthetic bacteria originated in oceans
-filled ocean with dissolved oxygen (and then started to leak into atmosphere)
-free oxygen appeared in atmosphere (about 2 billion years ago-bc they find fossils with rust iron
oxide that are fixed in stone 2 billion years ago)
-stomatolites: colonies of photosynthetic bacteria in oceans (oldest known fossils) !...
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