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Glycolysis is the first stage of cellular respiration, but it is in the cytosol that

a series of reactions happen and glucose is broken down into 2 pyruvates.

When these enter the mitochondrion through active transport (transport proteins),

the pyruvate binds with Coenzyme A to become acetyl CoA which then enters the citric acid cycle.

So the citric acid cycle, specifically the acetyl CoA attaching to the 4-carbon molecule oxaloacetate is the first stage of cellular respiration that occurs in the mitochondria.

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