The earliest form of photosynthesis did NOT involve the release of oxygen
I thought the answer would be cyanobacteria but i think it releases oxygen. Would it be a photoheterotroph or photoautotroph. would it use h2o to reduce co2 or not? im so confused because i thought photosynthesis always released oxygen...
I thought the answer would be cyanobacteria but i think it releases oxygen. Would it be a photoheterotroph or photoautotroph. would it use h2o to reduce co2 or not? im so confused because i thought photosynthesis always released oxygen...
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The earliest forms of photosynthesis is anoxygenic photosynthesis. Meaning, not producing oxygen. Highly reduced species such as H2S are used as an electron source. Cleaving H2S produces H2 and elemental sulfur.
The organisms that can do this contain only 1 of the photosystems (PS), not both. So you have some bacteria that have PSI or PSII, not both. Both PSI and PSII are required for cleaving water (cyanobacteria).
Some photoautotrophic bacteria are the green sulfur bacteria.
http://en.wikipedia.org/wiki/Green_sulfu…
A photoheterotroph would most likely be a purple non-sulfur bacterium. They do not fix CO2, they require their carbon source from the carbohydrates, fats etc.
http://en.wikipedia.org/wiki/Photohetero…
The organisms that can do this contain only 1 of the photosystems (PS), not both. So you have some bacteria that have PSI or PSII, not both. Both PSI and PSII are required for cleaving water (cyanobacteria).
Some photoautotrophic bacteria are the green sulfur bacteria.
http://en.wikipedia.org/wiki/Green_sulfu…
A photoheterotroph would most likely be a purple non-sulfur bacterium. They do not fix CO2, they require their carbon source from the carbohydrates, fats etc.
http://en.wikipedia.org/wiki/Photohetero…