Multiple Choice
Which enzyme speeds up the reaction between carbon dioxide and ribulose-1,5-bisphosphate (RuBP) to restart the Calvin cycle?
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9. Photosynthesis
Calvin Cycle
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If a plant lacked all pigments, how would this affect the Calvin cycle?
A
The Calvin cycle would not occur because pigments are required to capture light energy for ATP and NADPH production.
B
The Calvin cycle would use pigments as a direct carbon source.
C
The Calvin cycle would produce more glucose due to the absence of pigments.
D
The Calvin cycle would proceed normally because it does not require pigments directly.
Verified step by step guidance1
Understand the role of pigments in photosynthesis: Pigments, such as chlorophyll, are essential for capturing light energy during the light-dependent reactions of photosynthesis. This energy is used to produce ATP and NADPH, which are required for the Calvin cycle.
Clarify the relationship between the light-dependent reactions and the Calvin cycle: The Calvin cycle (light-independent reactions) relies on the ATP and NADPH generated during the light-dependent reactions to fix carbon dioxide into glucose.
Analyze the scenario where pigments are absent: Without pigments, the plant cannot capture light energy, and as a result, the light-dependent reactions cannot produce ATP and NADPH.
Determine the impact on the Calvin cycle: Since the Calvin cycle depends on ATP and NADPH, the absence of these molecules would prevent the Calvin cycle from occurring.
Conclude the correct answer: The Calvin cycle would not occur because pigments are required to capture light energy for ATP and NADPH production.
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