The assimilatory and reducing powers synthesized in the light reaction of photosynthesis are utilized in:
Correct answer: C. Reduction phase of Calvin cycle
- A. Fixation phase of Calvin cycle
- B. Regeneration phase of Calvin cycle
- C. Reduction phase of Calvin cycle
- D. Condensation phase of Calvin cycle
Explanation
The Calvin cycle consists of three main phases: fixation, reduction, and regeneration. The reduction phase is where the assimilatory and reducing powers, ATP and NADPH, are utilized. In this phase, 3-phosphoglycerate is converted into glyceraldehyde-3-phosphate (G3P) using ATP and NADPH from the light reactions. This phase involves the reduction of 3-phosphoglycerate and incorporation of energy and electrons, which is why ATP and NADPH are crucial. The fixation phase focuses on CO₂ incorporation and does not directly use ATP or NADPH, while the regeneration phase uses ATP but not NADPH. The 'condensation phase' does not exist in the Calvin cycle.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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More Bioenergetics questions
During the first step of the reduction phase of the Calvin cycle, the following change occurs:
The Calvin cycle begins when a molecule of CO₂ reacts with a highly reactive phosphorylated five-carbon sugar named:
First phase of Calvin cycle is:
The phase of the Calvin cycle in which fewer ATPs of the light reaction are used is:
The number of CO₂, NADPH, and ATP molecules, respectively, required for one Calvin cycle is:
The number of CO₂, NADPH₂, and ATP molecules required to synthesize one maltose molecule from the output of the Calvin cycle is, respectively: