Rna first and why show catalytic properties ribozymes

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Unformatted text preview: 5. RNA first and why?: show catalytic properties (ribozymes-RNA that's able to catalyze a chemical reaction) -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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