During photosynthesis-linked carbohydrate synthesis in plants, the products of photosynthesis are required for the actual fixation of carbon. Which of the following correctly explains the use of the products of photosynthesis? A) NADPH is required for the actual reduction of CO₂ by the RUBISCO enzyme. B) ATP is used primarily during the regeneration of ribulose-1,5-bisphosphate C) Oxygen is used during the oxidation of glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate D) Protons from the formation of the proton gradient are required to activate the RUBISCO enzyme E) Both A and B are correct

Question

Quizplus · Accepted Answer

ATP is primarily used during the regeneration of ribulose-1,5-bisphosphate, which is necessary to continue the fixation of carbon during photosynthesis. NADPH is used for the reduction of other molecules during the Calvin cycle. Oxygen is a byproduct of photosynthesis and not directly used in carbohydrate synthesis. Protons generated during the light reactions are involved in ATP synthesis, but not in the activation of RUBISCO. Option E is incorrect because oxygen is not used during the oxidation of glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate.

During Photosynthesis-Linked Carbohydrate Synthesis in Plants, the Products of Photosynthesis