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Because Prokaryotic cells contain no membrane bound organelles - the only thing they can use to create the proton concentrations needed for oxidative phosphorylation (ATP production), and photosynthesis, is the plasma membrane, which isn't as exposed in Prokaryotes as in Eukaryotic cells. Prokaryotes not only have a cell wall protecting their plasma membrane, they also have a "capsule" which provides additional support and separation for the plasma membrane, allowing it to perform this important task of creating ATP.

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Q: What replaces the mitochondria as the site of cellular respiration in prokaryotes?
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