The citric acid cycle is a cycle because the starting molecule, , is regenerated at the end.

Oxaloacetate

Oxaloacetate

Explanation:

At the end of this series of reactions, the four-carbon starting molecule, oxaloacetate, is regenerated, allowing the cycle to begin again. In the first step of the cycle, acetyl CoAstart text, C, o, A, end text combines with a four-carbon acceptor molecule, oxaloacetate, to form a six-carbon molecule called citrate.

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