To test the hypothesis that a particular plant synthesizes storage lipids by using glyceraldehyde 3-phosphate (G3P) from photosynthesis, a researcher plans to use radiolabeled precursors to track the molecules through the biosynthetic pathway. Which of the following radiolabeled precursors is most appropriate for the researcher to use?

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Plants convert carbon dioxide to sugars through the process of carbon fixation. Tracking the carbon from \(\ce{CO2}\) will verify the destination of carbon atoms.