Figure 8.2
-Use Figure 8.2 and the compounds labeled A, B, C, D, and E to answer the following question. If the carbon atom of each of the incoming CO₂ molecules is labeled with a radioactive isotope of carbon, which organic molecules of the Calvin cycle will be radioactively labeled after one cycle?

Question

Quizplus · Accepted Answer

In the Calvin cycle, CO₂ is fixed into an organic molecule. The carbon from CO₂ is incorporated into 3-phosphoglycerate (3-PGA), which is then converted into other molecules in the cycle. Therefore, after one cycle, the molecules that are derived from 3-PGA, such as B, C, D, and E, will be radioactively labeled.

Figure 8.2 -Use Figure 8.2 and the Compounds Labeled A, B, C