Photosynthetic bacteria which do not use water as the ultimate source of electrons

Question

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Photosynthetic bacteria that do not use water as the ultimate source of electrons do not produce oxygen. These bacteria, known as anoxygenic photosynthetic bacteria, use other molecules such as hydrogen sulfide, ferrous ions, or organic molecules as the electron source instead of water, and as a result, do not release oxygen as a byproduct of their photosynthesis.

Photosynthetic Bacteria Which Do Not Use Water as the Ultimate