In the C3 pathway, where does the carbon come from to form glucose?

Question

Quizplus · Accepted Answer

The carbon in the C3 pathway comes from atmospheric CO2, which is fixed by the enzyme Rubisco during the Calvin cycle to create glucose. ATP and NADPH provide the energy and reducing power necessary for the cycle, but they do not supply the carbon itself. Chlorophyll and water are involved in the light-dependent reactions of photosynthesis but are not directly involved in the C3 pathway. Enzymes are used throughout photosynthesis but do not provide the carbon for glucose synthesis.

In the C3 Pathway, Where Does the Carbon Come from to Form