Questions and Answers
Where does the Calvin Cycle take place?
In the stroma of the chloroplasts.
What are the three phases or steps of the Calvin Cycle?
Fixation, reduction, and regeneration.
What happens during fixation?
RuBisCo combines with RuBP and CO2 forming a 6 carbon molecule that immediately breaks down into a 3 carbon PGA.
What is the name of the enzyme that makes fixation happen?
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What happens during the reduction phase of the Calvin Cycle?
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How does the reduction phase link the light reactions to the Calvin Cycle?
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What happens during the regeneration phase of the Calvin Cycle?
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Study Notes
Calvin Cycle Overview
- Occurs in the stroma of chloroplasts, a site crucial for photosynthesis.
- Essential for converting carbon dioxide and energy into glucose through a series of reactions.
Phases of the Calvin Cycle
- Comprises three main phases: fixation, reduction, and regeneration.
Fixation Phase
- Involves the enzyme RuBisCo, which catalyzes the reaction between carbon dioxide (CO2) and ribulose bisphosphate (RuBP).
- This reaction produces a 6-carbon molecule that quickly breaks down into two 3-carbon molecules known as phosphoglycerate (PGA).
Reduction Phase
- ATP and NADPH from light-dependent reactions convert PGA into glyceraldehyde-3-phosphate (G3P), a high-energy 3-carbon compound.
- This phase connects to light reactions, as one out of every six G3P molecules is utilized to synthesize glucose, linking energy capture to carbon fixation.
Regeneration Phase
- Involves the regeneration of ribulose bisphosphate (RuBP) using G3P and ATP.
- This step is crucial for continuing the cycle, enabling the fixation of additional carbon dioxide.
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Description
Test your knowledge of the Calvin Cycle with these flashcards. Learn about its location, phases, and key processes like fixation and the enzyme RuBisCo. Perfect for biology students and enthusiasts alike!
