Multiple Choice
In which part of the chloroplast do the light-independent reactions (Calvin Cycle) occur?
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9. Photosynthesis
Calvin Cycle
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Why is the series of reactions in the Calvin cycle referred to as a "cycle"?
A
Because the final product of the pathway is used to regenerate the initial molecule, allowing the process to repeat.
B
Because it directly releases oxygen as a byproduct in each turn.
C
Because it occurs only once during the lifetime of a plant cell.
D
Because it produces ATP in a circular pathway.
Verified step by step guidance1
Step 1: Begin by understanding the Calvin cycle, which is a series of biochemical reactions that occur in the stroma of chloroplasts during photosynthesis. Its primary function is to fix carbon dioxide into organic molecules.
Step 2: Recognize that the Calvin cycle is referred to as a 'cycle' because it regenerates its starting molecule, ribulose-1,5-bisphosphate (RuBP), at the end of the process. This regeneration allows the cycle to repeat continuously.
Step 3: Note that the Calvin cycle does not directly release oxygen as a byproduct. Oxygen is released during the light-dependent reactions of photosynthesis, not the Calvin cycle.
Step 4: Understand that the Calvin cycle does not occur only once during the lifetime of a plant cell. It is a continuous process as long as the plant has access to carbon dioxide, ATP, and NADPH.
Step 5: Clarify that the Calvin cycle does not produce ATP. Instead, it uses ATP and NADPH generated during the light-dependent reactions to drive the fixation and reduction of carbon dioxide into glucose precursors.
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