Assertion: anoxygenic photosynthesis | /r/AtLocation | photosynthetic bacteria
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text: In oxygenic photosynthesis, 2A is O2, whereas in anoxygenic photosynthesis, which occurs in some photosynthetic bacteria, the electron donor can be an inorganic hydrogen donor, such as H2S (in which case A is elemental sulfur) or an organic hydrogen donor such as succinate (in which case, A is fumarate).