Final answer:
The citric acid cycle occurs in the matrix of mitochondria, recycling compounds to produce energy.
Explanation:
The citric acid cycle, also known as the Krebs cycle, takes place in the matrix of mitochondria. Unlike glycolysis, this cycle is a closed loop where the last part regenerates the compound used in the first step. It involves a series of reactions producing CO₂, GTP/ATP, NADH, and FADH₂.
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