| Plant photosynthesis | Bacterial photosynthesis | |
| Organisms | Plants, Algae, Cyanobacteria | Purple and green bacteria |
| Produces O2 | yes | no |
| Type of chlorophyll | chlorophyll a
absorbs 650-750nm |
bacteriochlorophylls
absorbs 800-1000nm |
| Photosystem I | present | present |
| Photosystem II | present | absent |
| Photosynthetic electron donor | H2O | H2S, other sulfur compounds, or
certain organic compounds |
Image Photosystem I & 3D view in Chime, Jmol or Webmol : protein map PSI : Image Photosystem II : Interactive diagram PS II :
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