In green and purple bacteria electrons to reduce CO2 come from?

Answer 1

H2S

Green and purple bacteria carry out anoxygenic photosynthesis, using reduced molecules other than water, as an electron source for the generation of NADH and NADPH

- Purple sulfur bacteria use reduced sulfur compounds as electron sources and accumulate sulfur granules within their cell

- Green sulfur bacteria use reduced sulfur compounds as electron sources and deposit sulfur granules outside their cell

- Purple nonsulfur bacteria use organics molecules as their electron sourcec

Answer 2

In green sulfur bacteria, electrons to reduce CO2 come from hydrogen sulfide (H2S). In purple bacteria, electrons come from organic compounds like organic acids or alcohols.