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BotanyNEET 2024Calvin cycle, C4 pathway, photorespiration

Photosynthesis in Higher Plants

How many molecules of ATP and NADPH are required for every molecule of CO2\mathrm{CO_2} fixed in the Calvin cycle?

  1. A.2 molecules of ATP and 2 molecules of NADPH
  2. B.3 molecules of ATP and 3 molecules of NADPH
  3. C.3 molecules of ATP and 2 molecules of NADPH✓
  4. D.2 molecules of ATP and 3 molecules of NADPH

Solution

Each CO2\mathrm{CO_2} fixed in the Calvin cycle costs 3 ATP and 2 NADPH — 18 ATP and 12 NADPH per hexose.

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