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Questions and Answers
In the Calvin cycle, 6 molecules of $CO_2$ must be fixed to produce 1 molecule of glyceraldehyde-3-phosphate (G3P).
In the Calvin cycle, 6 molecules of $CO_2$ must be fixed to produce 1 molecule of glyceraldehyde-3-phosphate (G3P).
False (B)
In a chloroplast, thylakoid stacks are connected to each other by stroma lamellae.
In a chloroplast, thylakoid stacks are connected to each other by stroma lamellae.
False (B)
Ferredoxin (FD) oxidizes the primary electron acceptor in Photosystem II (P680).
Ferredoxin (FD) oxidizes the primary electron acceptor in Photosystem II (P680).
False (B)
The reactions of carbon fixation depend on the light reactions to supply ATP and NADPH.
The reactions of carbon fixation depend on the light reactions to supply ATP and NADPH.
Light energy is principally transferred by chlorophyll b in the reaction centres of Photosystem I and II.
Light energy is principally transferred by chlorophyll b in the reaction centres of Photosystem I and II.
A photosystem typically contains chlorophyll molecules, accessory pigments, and proteins embedded in the thylakoid membrane.
A photosystem typically contains chlorophyll molecules, accessory pigments, and proteins embedded in the thylakoid membrane.
Carbon fixation occurs in the stroma of a chloroplast.
Carbon fixation occurs in the stroma of a chloroplast.
Light absorption by plants in the 680nm range of light is primarily due to chlorophyll a.
Light absorption by plants in the 680nm range of light is primarily due to chlorophyll a.
The stomata of a $C_3$ plant opens at night to prevent water loss.
The stomata of a $C_3$ plant opens at night to prevent water loss.
In general, photosynthesis rates increase at higher temperatures.
In general, photosynthesis rates increase at higher temperatures.
PEP carboxylase is the enzyme responsible for fixing $CO_2$ in the Calvin Cycle.
PEP carboxylase is the enzyme responsible for fixing $CO_2$ in the Calvin Cycle.
Cacti store $CO_2$ in their vacuoles in the form of an organic acid called malate.
Cacti store $CO_2$ in their vacuoles in the form of an organic acid called malate.
Which of the following is the primary electron acceptor in Photosystem I?
Which of the following is the primary electron acceptor in Photosystem I?
Where does carbon fixation primarily occur in a chloroplast?
Where does carbon fixation primarily occur in a chloroplast?
In CAM plants, stomata open at ______ to prevent water loss.
In CAM plants, stomata open at ______ to prevent water loss.
Light absorption in the 680nm range is primarily due to chlorophyll ______.
Light absorption in the 680nm range is primarily due to chlorophyll ______.
What two products from the light reactions are essential for carbon fixation?
What two products from the light reactions are essential for carbon fixation?
Match the following plant types with their stomatal behavior:
Match the following plant types with their stomatal behavior:
Which enzyme facilitates the initial fixation of carbon dioxide in $C_4$ and CAM plants?
Which enzyme facilitates the initial fixation of carbon dioxide in $C_4$ and CAM plants?
In what form do plants like cacti store $CO_2$ in their vacuoles?
In what form do plants like cacti store $CO_2$ in their vacuoles?
Flashcards
Calvin Cycle Stoichiometry
Calvin Cycle Stoichiometry
In the Calvin cycle, it takes 6 molecules of COâ‚‚ to produce 2 molecules of glyceraldehyde-3-phosphate (G3P).
Connected Grana
Connected Grana
Thylakoid stacks are connected to each other by grana lamellae.
Ferrodoxin Function
Ferrodoxin Function
Ferrodoxin (FD) oxidizes the primary electron acceptor in Photosystem I (P700).
Carbon Fixation Requirements
Carbon Fixation Requirements
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Light Energy Transfer
Light Energy Transfer
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Photosystem components
Photosystem components
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Location of Carbon Fixation
Location of Carbon Fixation
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680nm Absorption
680nm Absorption
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CAM Plant Stomata
CAM Plant Stomata
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Photosynthesis at High Temperatures
Photosynthesis at High Temperatures
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PEP Carboxylase Function
PEP Carboxylase Function
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Cacti COâ‚‚ Storage
Cacti COâ‚‚ Storage
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Study Notes
- 6 molecules of CO2 are fixed to produce 1 molecule of glyceraldehyde-3-phosphate (G3P) in the Calvin cycle.
- It actually takes 2 molecules of G3P.
- Thylakoid stacks are connected to each other by grana in a chloroplast.
- Ferredoxin (FD) oxidizes the primary electron acceptor in Photosystem I, not Photosystem II (P680).
- The reactions of carbon fixation depend on the light reactions to supply ATP and NADPH.
- Light energy is mainly transferred by chlorophyll a in the reaction centers of Photosystems I and II, not chlorophyll b.
- A photosystem usually contains chlorophyll molecules, accessory pigments, and proteins embedded in the thylakoid membrane.
- Carbon fixation occurs in the stroma of a chloroplast, not stomata.
- Light absorption by plants in the 680nm range of light is primarily due to chlorophyll a.
- Stomata of CAM plants open at night to prevent water loss.
- Photosynthesis rates generally decrease at higher temperatures.
- PEP carboxylase is the enzyme responsible for fixing CO2 in C4 and CAM plants, not in the Calvin Cycle.
- Cacti store CO2 in their vacuoles in the form of an organic acid called malate.
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