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Study
A-level Photosythesis
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What happens to GP in the Calvin cycle?
It is reduced to TP using ATP and NADPH
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What is the fate of most TP molecules?
Regenerate RuBP
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What is photolysis?
Splitting of water using light energy
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Which molecule accepts electrons at the end of the electron transport chain?
NADP
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What is the role of ATP in photosynthesis?
Provides energy for the Calvin cycle
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What happens to TP to form glucose?
Two TP molecules combine to form one hexose sugar
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What enzyme catalyses carbon fixation in the Calvin cycle?
RuBisCO
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What are the three limiting factors of photosynthesis?
Light intensity, carbon dioxide concentration, temperature
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Where does the Calvin cycle take place?
Stroma
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Which pigment is primarily responsible for absorbing light energy?,
Chlorophyll a
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What is the overall equation for photosynthesis?,
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
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What are the products of the light-dependent reactions?
ATP, reduced NADP (NADPH), and oxygen
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What is the source of oxygen released during photosynthesis?
Photolysis
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What is the role of reduced NADP (NADPH)?
Provides hydrogen/reducing power in the Calvin cycle
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What molecule is formed when CO₂ combines with RuBP?
GP (glycerate-3-phosphate)
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What effect does increasing light intensity have on photosynthesis?
Rate increases until another factor becomes limiting
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What is the source of electrons in the light-dependent reactions?
Photolysis of water
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What is the role of RuBP in photosynthesis?
CO₂ acceptor in the Calvin cycle
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What is the fate of some TP molecules?
Used to form glucose and other organic molecules
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In which organelle does photosynthesis occur?,
Chloroplast
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