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In which one of the following do the two names refer to one and the same thing?

1. Tricarboxylic acid cycle and urea cycle
2. Krebs cycle and Calvin cycle
3. Tricarboxylic acid cycle and citric acid cycle
4. Citric acid cycle and Calvin cycle

Correct answer: Tricarboxylic acid cycle and citric acid cycle

Solution

The tricarboxylic acid cycle and the citric acid cycle are two names for the same pathway in cellular respiration. Both refer to the cycle centered on citrate (citric acid), so they are identical terms.

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