L11 Phototrophy and Autotrophy

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6 Terms

1
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Phototrophy

use of light as an energy source to generate ATP

  • light energy → chemical energy

2
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photosynthesis

photoautotrophy

  • light is energy source

  • CO2 is carbon source

1) Light → ATP

2) ATP + CO2 + e- → organic molecules

3
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oxygenic phototrophy

oxygen generated

  • H2O is electron donor

  • ATP and NADPH generated

4
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anoxygenic phototrophy

no oxygen generated

  • H2S, Fe2+, H2 are common electron DONORS

  • cyclic energy flow generates PMF + ATP

    • cyclic photophosphorylation

5
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autotrophy

carbon fixation (dark rxns/calvin cycle)

  • CO2 → sugar + other organic molecules that go into biosynthesis

  • need energy and reducing power (e- source)

    • ATP and NADPH/NADH/Fd

  • requires 18 ATP + 12 NAD(P)H

    • come from photosynthesis

6
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why do autotrophy

  • allows storage of glucose → future energy source

  • CO2 is a constant + abundant carbon source