3 ms·
maybe they are referring to this?* https://en.wikipedia.org/wiki/Cyanobacteria#Metabolism https://en.wikipedia.org/wiki/Cyanobacteria#Metabolism "In general,
by fsckboy 3y ago
maybe they are referring to this?*
https://en.wikipedia.org/wiki/Cyanobacteria#Metabolism https://en.wikipedia.org/wiki/Cyanobacteria#Metabolism
"In general, photosynthesis in cyanobacteria uses water as an electron donor and produces oxygen as a byproduct, though some may also use hydrogen sulfide[77] a process which occurs among other photosynthetic bacteria such as the purple sulfur bacteria."
* I found it by searching for "oxygen"
- citrate05 3y agoIf you use hydrogen sulfide as an electron donor, you end up liberating sulfur, not oxygen. Contrary to grandparent, in oxygenic photosynthesis, the oxygen does come from splitting water. The resulting hydride used to "charge" an electron carrier: https://en.wikipedia.org/wiki/Photodissociation#Photolysis_in_photosynthesis https://en.wikipedia.org/wiki/Photodissociation#Photolysis_i... The CO2 gets fixed into carbohydrates. Some water is generated in that process, but no molecular oxygen.