Biologists believe that in the earliest version of photosynthesis the energized photosystem electron simply cycled back to the chlorophyll molecule. What limitations would such a system impose? A)No molecular oxygen would be generated. B)No electrons would be available to reduce the carbon in CO₂. C)Cells could produce ATP but not sugars. D)all of the above

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If the energized photosystem electron simply cycled back to the chlorophyll molecule, it would mean that there is no external electron acceptor and hence, molecular oxygen would not be generated. This would also mean that there would be no electrons available to reduce the carbon in CO₂, making it difficult for cells to produce sugars through photosynthesis. Although ATP could still be produced through cyclic photophosphorylation, the inability to produce sugars and oxygen would limit the efficiency of this system.

Biologists Believe That in the Earliest Version of Photosynthesis the Energized