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why is it called a cycle rather than a pathway like glycolysis? This question is referred...

why is it called a cycle rather than a pathway like glycolysis?

This question is referred to the citric acid cycle (kreb cycle) and glycolysis.
Why is it called a cycle rather than a pathway like glycolysis?
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Answer #1

Unlike glycolysis, the citric acid cycle or TCA cycle has a closed-loop structure. The final step of the pathway (synthesis of oxaloacetate from malate) regenerates the compound used in the first step. The oxaloacetate can again take up acetyl CoA and another cycle of reaction can take place. Through a series of steps, citrate will again be oxidized, and NADH, GTP, and carbon dioxide will be released.

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