Question
How many ATP molecules are required in the C₄
pathway for the synthesis of one molecule of glucose?Solution
In the C₄ pathway (Hatch-Slack pathway), the synthesis of one molecule of glucose requires a total of 30 ATP molecules . Here's a breakdown of how this energy is utilized: ATP Requirements:
- C₄ Cycle (Initial CO₂ Fixation in Mesophyll Cells):
- 2 ATP molecules are consumed to regenerate phosphoenolpyruvate (PEP) from pyruvate for every CO₂ molecule fixed in the C₄ cycle.
- For the production of one glucose molecule, 6 CO₂ molecules are required, so 6 × 2 = 12 ATP are used in the C₄ cycle.
- Calvin Cycle (C₃ Pathway in Bundle-Sheath Cells):
- The Calvin cycle requires 18 ATP molecules to synthesize one glucose molecule (as in the C₃ pathway).
- 12 ATP from the C₄ cycle + 18 ATP from the Calvin cycle = 30 ATP molecules.
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