carbon

Context/Location: Respiration beyond sugars

Cells recycle reduced carbon compounds, building them into different molecules as needed.  However, once the carbon is completely oxidized to carbon dioxide it is released from the cell and can only be reused eventually by photosynthetic organisms.

CO2 made with 14C

If CO2 labeled with 14C is added to a suspension of photosynthesizing chloroplasts, which compound will first become labeled with 14C?

 A. ATP

B. NADPH

C. RuBP

D. C6 H12O6

E. 3-phosphoglycerate

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