Cell Evolution Lecture 9

Cell Evolution - Cell Evolution Lecture 9 Evolution of cellular life 1 Numbers and diversity of bacteria archaea(prokaryotes 2 A unifying phylogeny

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Cell Evolution – Lecture 9 Evolution of cellular life 1. Numbers and diversity of bacteria archaea (prokaryotes) 2. A unifying phylogeny: the three domains 3. What everyone needs to know about these microbes (description of some key phyla) 4. The origin of the eukaryotic cell and endosymbiotic theory 5. Multicellularity Prokaryotic diversity and numbers Numbers: - Estimated 10^30 prokaryotes on earth - As many as 10^14 microbial cells associated with an adult human body - Our microbes extend our metabolic capabilities and aid in the development of our immune sys. - Most microbes are benign, or even useful, but we know the most about those that cause us harm (pathogens) Bacteria and archaea are metabolically versatile 1. responsible for carbon cycling 2. generate components of our atmosphere (oxygen, ozone) 3. use light for energy, derive energy from mineral transformations, biogeochemical cycling, fix carbon, fix nitrogen 4. breakdown complex organics – bioremediation (using organisms to breakdown or clean-up pollution 5. some have capacity to live in environments where we could not survive: “extremophiles” Nutritional Modes - Photoautotrpohs get energy from light, and get carbon from CO2
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This note was uploaded on 02/15/2011 for the course BIOG 101 taught by Professor Tatwick during the Fall '09 term at Colorado Christian.

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Cell Evolution - Cell Evolution Lecture 9 Evolution of cellular life 1 Numbers and diversity of bacteria archaea(prokaryotes 2 A unifying phylogeny

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