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Example Questions
Example Question #1 : Glycogenolysis
Which of the following compounds is regenerated in the citric acid cycle?
Possible Answers:
Succinate
Citrate
Oxaloacetate
Pyruvate
Correct answer:
Oxaloacetate
Explanation:
Oxaloacetate is the four-carbon molecule that is regenerated by the enzyme malate dehydrogenase in order to continue the cycle to form citrate with acetyl-CoA in the first step of the Krebs cycle. The other answer choices are intermediates of the citric acid cycle, but only oxaloacetate is regenerated, making it a true cycle.
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