In the light-independent stage of photosynthesis, the CO₂ combines with _ to form an unstable 6-carbon intermediate.
Correct answer: A. Ribulose bisphosphate
- A. Ribulose bisphosphate
- B. Hexose sugar
- C. Glycerate-3-phosphate
- D. Glyceraldehyde-9-phosphate
Explanation
In the light-independent stage of photosynthesis, also known as the Calvin cycle or dark reactions, carbon dioxide (CO2) combines with a five-carbon sugar called ribulose-1,5-bisphosphate (RuBP) to form an unstable 6-carbon intermediate. The enzyme responsible for this initial reaction is ribulose-1,5-bisphosphate carboxylase/oxygenase, commonly abbreviated as Rubisco.
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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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