With the exception of the blue-green bacteria and photochlorobacteria, photosynthetic bacteria use either hydrogen sulfide or hydrogen of organic molecules and carbon dioxide produce carbohydrates without releasing oxygen.

Question

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Photosynthetic bacteria, excluding blue-green bacteria (cyanobacteria) and photochlorobacteria, primarily utilize hydrogen sulfide or organic molecules as a source of electrons for photosynthesis, converting carbon dioxide into carbohydrates without the production of oxygen as a byproduct. This process is distinct from oxygenic photosynthesis performed by plants and cyanobacteria, which use water as an electron source, releasing oxygen.

With the Exception of the Blue-Green Bacteria and Photochlorobacteria, Photosynthetic