Illustrate sulfur photosynthetic bacteria, Biology

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Q. What is the molecule that donates hydrogen for photosynthesis, in sulfur photosynthetic bacteria?

In sulfur photosynthetic bacteria the substance that donates hydrogen is hydrogen sulfide (H2S) not water. Therefore there is no liberation of molecular oxygen but there is production of molecular sulfur (S2) Oxygen and sulfur has same number of valence electrons.


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