Oxaloacetate Uniformly Labeled with ¹⁴C (I

question 87

Multiple Choice

Oxaloacetate uniformly labeled with ¹⁴C (i.e., with equal amounts of ¹⁴C in each of its carbon atoms) is condensed with unlabeled acetyl-CoA. After a single pass through the citric acid cycle back to oxaloacetate, what fraction of the original radioactivity will be found in the oxaloacetate?

• A) All
• B) 1/2
• C) 1/3
• D) 1/4
• E) 3/4

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