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(A) Photosynthesis is generally an oxygenic process in plants,algae,and cyanobacteria,where $H_2O$ is used as an electron donor,resulting in the relea

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Rhodospirillum

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(A) Photosynthesis is generally an oxygenic process in plants,algae,and cyanobacteria,where $H_2O$ is used as an electron donor,resulting in the release of $O_2$. However,in certain photosynthetic bacteria like purple and green sulfur bacteria (e.g.,$Rhodospirillum$),$H_2O$ is not used as an electron donor. Instead,they use compounds like $H_2S$ or other organic compounds. Consequently,these organisms do not evolve $O_2$ during photosynthesis. $Spirogyra$,$Chlamydomonas$,and $Ulva$ are algae that perform oxygenic photosynthesis.

Photosynthesis without the evolution of oxygen is a characteristic of which of the following?

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