SME
Principles of Biology I · Problem type
Where respiration and photosynthesis happen
Use this for “Where are NADH and FADH₂ made, and where does O₂ go in respiration?”
Explore
In the cytoplasm, glucose (6C) splits into two pyruvate (3C): 2 ATP spent and 4 made, so 2 ATP and 2 NADH net.
It needs no oxygen.
Assumptions
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Counted per glucose: textbooks today give 30–32 ATP in all; older ones say 36–38.
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Each NADH yields about 2.5 ATP at the electron transport chain, and each FADH₂ about 1.5.
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Photosynthesis runs in the chloroplast and respiration in the cytoplasm and mitochondrion.
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