Purple and Green Photosynthetic Bacteria Anoxygenic photosynthesis Purple and green sulfur bacteria light 2H20+CO2 (CH2O)+H20+O2 2H2S CO2 igt→(CH20)+H20+2S0 • Anoxygenic photosynthesis • Purple and green sulfur bacteria Purple and Green Photosynthetic Bacteria 2H2O + CO2 light (CH2O) + H2O + O2 2H2S + CO2 light (CH2O) + H2O + 2S0