BIOL113 module 2- lecture 3

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4 Terms

1
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Nitrogen gas can’t be…

used directly by most organisms, so it is fixed into more readily available forms.

2
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Diazatroph

nitrogen-eating bacteria

3
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2 types of Diazatroph

  1. symbiotic- in root nodules of legumes

  2. free living- in soil

4
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what processes occurred before oxygen was enriched?

  1. fermentation

  2. anaerobic respiration (uses something other than oxygen as an electron acceptor)

  3. some photosynthesis (with something other than H2O as an electron donor)