There are three groups of photosynthetic bacteria: cyanobacteria, purple bacteria, and green bacteria. The cyanobacteria differ most fundamentally from photosynthetic purple and green bacteria in being able to carry out oxygenic photosynthesis (Section 6.8); the purple bacteria and green bacteria use an-oxygenic photosynthesis carried out with bacteriochlorophylls and other accessory pigments. Here the discussion is […]