History of Life

Surfaces and compartments come in handy gradients can

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Unformatted text preview: based on RNA is less likely to persist than the information in a DNA molecule RNA is somehow involved in gene regulation 96% of DNA gets transcribed Not known what all the RNA is doing Why cells? Surfaces and compartments come in handy Gradients can occur, in order to do work Why genomes? Replication information, another gene for acquiring nutrients, making reactions happen division of labor Benefits of collaboration The first billion years of life Prokaryotes. Crown group: any species that exists that are descendants of a common ancestor of an extant group. Stem: group before common ancestor of crown group, must be extinct Photosynthesis Anoxygenic photosynthesis Example: green sulfur bacteria use H2S Oxygenic photosynthesis E.g.: cyanobacteria use H2O Thanks to photosynthesis: oxidized electron acceptors (S˚ or O2) Prokaryotic diversity is really...
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