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why is the total ATP generated from cellular respiration different for prokaryotes compared to eukaryotes?

why is the total ATP generated from cellular respiration different for prokaryotes compared to eukaryotes?
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The prokaryotes generate around 38 ATP during the cellular respiration whereas eukaryotes produce 36 ATP. So, there is only the difference of 2 ATP between prokaryotes and eukaryotes. The difference is because prokaryotes are without cellular organelle. In prokaryotes, all sub-process of cellular respiration take place in cytoplasm and plasma membrane whereas in eukaryotes cellular respiration take place in cytoplasm, mitochondria and mitochondrial membrane.

Prokaryotic Cells Glycolysis: Cytoplasm Krebs Cycle: Cytoplasm ETC: Cell Membrane Eukaryotic Cells Glycolysis: Cytoplasm Kreb

Figure: Comparison of the cellular location of three process include in cellular respiration.

So, in eukaryotes, NADH molecules produce during glycolysis go to mitochondria for Kreb's cycle that consume 2 ATP and therefore yields only 36 ATP whereaa prokaryotes produce 38 ATP.

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