Comparison of Plant and Bacterial Photosynthesis

Plant photosynthesis Bacterial photosynthesis
Organisms Plants, Algae, Cyanobacteria Purple and green bacteria
Produces O2 yes no
Type of chlorophyll chlorophyll a

absorbs 650-750nm


absorbs 800-1000nm

Photosystem I

(cyclic photophosphorylation)

present present
Photosystem II

(noncyclic photophosphorylation)

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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