Photosynthesis

A large number of microorganisms have the ability to use sunlight to generate ATP through photophosphorylation. This procedure may not generate oxygen a reaction termed anoxygenic, as found in the green and purple Bacteria or it may generate oxygen, termed oxygenic by the photolysis of water as found in the blue green Bacteria and algae in Table 1. The reactions are  complex but  can  be divided into  two sets  of reactions the  light reactions where light energy is converted into  chemical energy (ATP) and  the  dark  reactions where ATP is used to synthesize glucose.