Topic_15___Biosphere_II - Topic 15: Biosphere II - Life...

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Topic 15: Biosphere II - Life Processes on Earth I. Biosphere interacts with atmosphere, hydrosphere and lithosphere a. Environmental range of biosphere i. Biosphere largely between 200 m deep in oceans to 3000m above sea level (Fig 4.1) ii. Diversity (number of species) is greatest at Equator and decreases toward the poles b. Unique on planets in our solar system? II. Catalog of Life (what is life?) a. Viruses i. Not alive ii. Acellular - genetic material + protein iii. Parasites iv. 0.02-0.25 micrometers in size v. Invasion in host animal commonly causes illness b. Prokaryotes Prokaryote Cell Eukaryote Cell i. Bacteria and cyanobacteria (blue-green algae) ii. Simple cells without a distinct nucleus, DNA throughout cell iii. Numerous processes (everywhere?!) 1. Fixation of carbon dioxide from atmosphere during photosynthesis: CO 2 + H 2 0 + Energy -> C 6 H 12 O 6 2. Methane production 3. Fermentation 4. Nitrogen fixation from atmosphere 5. Mineral crystallization in limestones and other rocks
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This note was uploaded on 09/02/2009 for the course GEO 302C taught by Professor Yang during the Spring '08 term at University of Texas at Austin.

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Topic_15___Biosphere_II - Topic 15: Biosphere II - Life...

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