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Mitochondria
Break down sugar to make ATP (cellular respiration) — found in almost all eukaryotic cells.
Chloroplasts
Build sugar using light (photosynthesis) — found only in plant and algae cells.
Same membrane trick
Both use an electron transport chain to pump H+ across a membrane, then let it flow back through ATP synthase to make ATP.
Key difference #1
Mitochondria pump H+ from matrix to intermembrane space; chloroplasts pump H+ from stroma into the thylakoid space.
Key difference #2
Mitochondria take electrons FROM food; chloroplasts get electrons FROM water split by light.
Key difference #3
Mitochondrial final electron acceptor is oxygen; chloroplasts' electrons end up in NADPH.