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using CO2 as sole carbon source requires
reducing power (high energy electrons have to be available to donate) and energy
what are the donors that provide reducing power?
the photosystems; p680 is a good donor by splitting water (water supplies the reducing power)
electrons donated, drops down to ground state. water is split to replenish electrons (water is the reducing power)
anoxygenic photosynthesis occurs in
purple bacteria, green sulfur/nonsulfur bacteria, gram positive, and acidobacteria
2nd step in Z scheme
p680 acts as a reducer and is then returned to its ground state potential (after it is reduced by an electron from water)
purple and green bacteria
preceded cyanobacteria (oxygenic; anoxygenic photosynthesis first form of photosynthesis on earth
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