Asked by john
Which explains how the Calvin cycle and the Krebs cycle differ?
The Calvin cycle uses ATP to make glucose.
The Krebs cycle uses ADP to make glucose.
Only the Calvin cycle occurs in plant cells.
The Krebs cycle only repeats in animal cells.
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The correct choice is: "The Calvin cycle uses ATP to make glucose."
Why: The Calvin cycle (in chloroplasts of plants and other photosynthetic organisms) uses ATP and NADPH from the light reactions to fix CO2 and build sugars. The Krebs (citric acid) cycle does not make glucose — it oxidizes acetyl‑CoA to CO2 and generates NADH, FADH2 and some ATP/GTP for cellular respiration. The other two statements are incorrect: the Calvin cycle is not limited to plants alone, and the Krebs cycle occurs in many aerobic organisms (not only animals).
Why: The Calvin cycle (in chloroplasts of plants and other photosynthetic organisms) uses ATP and NADPH from the light reactions to fix CO2 and build sugars. The Krebs (citric acid) cycle does not make glucose — it oxidizes acetyl‑CoA to CO2 and generates NADH, FADH2 and some ATP/GTP for cellular respiration. The other two statements are incorrect: the Calvin cycle is not limited to plants alone, and the Krebs cycle occurs in many aerobic organisms (not only animals).
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