Interpret Photosynthesis Energy Flow Models - Biology
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What is the name of the model describing electron energy changes from PSII to PSI?
What is the name of the model describing electron energy changes from PSII to PSI?
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Z-scheme (electron transport chain model). Shows electron energy changes through both photosystems.
Z-scheme (electron transport chain model). Shows electron energy changes through both photosystems.
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In energy-flow models, what does NADPH primarily provide to the Calvin cycle?
In energy-flow models, what does NADPH primarily provide to the Calvin cycle?
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High-energy electrons (reducing power). Supplies electrons needed for carbon reduction reactions.
High-energy electrons (reducing power). Supplies electrons needed for carbon reduction reactions.
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Choose the correct description of the Calvin cycle: produces ATP or consumes ATP?
Choose the correct description of the Calvin cycle: produces ATP or consumes ATP?
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Consumes ATP (and NADPH). Calvin cycle uses ATP rather than producing it.
Consumes ATP (and NADPH). Calvin cycle uses ATP rather than producing it.
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Which molecule is the source of the oxygen gas released during photosynthesis?
Which molecule is the source of the oxygen gas released during photosynthesis?
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Water ($H_2O$). Water molecules are split to provide electrons and protons.
Water ($H_2O$). Water molecules are split to provide electrons and protons.
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Which step is endergonic and requires energy input: making ATP or hydrolyzing ATP?
Which step is endergonic and requires energy input: making ATP or hydrolyzing ATP?
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Making ATP from ADP + P$_i$ is endergonic. Requires energy input to form high-energy bonds.
Making ATP from ADP + P$_i$ is endergonic. Requires energy input to form high-energy bonds.
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In the Z-scheme, what happens to electron energy as electrons move down the ETC?
In the Z-scheme, what happens to electron energy as electrons move down the ETC?
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Electron energy decreases stepwise. Energy is released as electrons move between carriers.
Electron energy decreases stepwise. Energy is released as electrons move between carriers.
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What are the reactant inputs to the Calvin cycle that represent energy and reducing power?
What are the reactant inputs to the Calvin cycle that represent energy and reducing power?
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ATP and NADPH. Chemical energy and reducing power for carbon fixation.
ATP and NADPH. Chemical energy and reducing power for carbon fixation.
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Which enzyme catalyzes carbon fixation by adding $CO_2$ to RuBP?
Which enzyme catalyzes carbon fixation by adding $CO_2$ to RuBP?
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Rubisco. Key enzyme that incorporates inorganic carbon into organic molecules.
Rubisco. Key enzyme that incorporates inorganic carbon into organic molecules.
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In energy-flow models, what does ATP primarily provide to the Calvin cycle?
In energy-flow models, what does ATP primarily provide to the Calvin cycle?
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Energy to drive endergonic reactions. Powers thermodynamically unfavorable carbon fixation steps.
Energy to drive endergonic reactions. Powers thermodynamically unfavorable carbon fixation steps.
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In energy-flow models, what does NADPH primarily provide to the Calvin cycle?
In energy-flow models, what does NADPH primarily provide to the Calvin cycle?
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High-energy electrons (reducing power). Supplies electrons needed for carbon reduction reactions.
High-energy electrons (reducing power). Supplies electrons needed for carbon reduction reactions.
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What are the main products that leave the Calvin cycle to contribute to sugar synthesis?
What are the main products that leave the Calvin cycle to contribute to sugar synthesis?
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G3P (a 3-carbon sugar). Three-carbon precursor for glucose and other sugars.
G3P (a 3-carbon sugar). Three-carbon precursor for glucose and other sugars.
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What molecules return from the Calvin cycle to the light reactions after energy is used?
What molecules return from the Calvin cycle to the light reactions after energy is used?
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ADP + P$_i$ and NADP$^+$. Depleted energy carriers return for regeneration.
ADP + P$_i$ and NADP$^+$. Depleted energy carriers return for regeneration.
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Which statement best describes energy flow: energy cycles or matter cycles in photosynthesis?
Which statement best describes energy flow: energy cycles or matter cycles in photosynthesis?
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Matter cycles; energy flows through and is not recycled. Energy flows one-way while matter is recycled.
Matter cycles; energy flows through and is not recycled. Energy flows one-way while matter is recycled.
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Identify the correct source of electrons that ultimately reduce NADP$^+$ in photosynthesis.
Identify the correct source of electrons that ultimately reduce NADP$^+$ in photosynthesis.
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$H_2O$ provides the electrons. Water is the ultimate electron donor in photosynthesis.
$H_2O$ provides the electrons. Water is the ultimate electron donor in photosynthesis.
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Choose the correct statement about $O_2$ in photosynthesis: from $CO_2$ or from $H_2O$?
Choose the correct statement about $O_2$ in photosynthesis: from $CO_2$ or from $H_2O$?
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$O_2$ comes from $H_2O$, not from $CO_2$. Oxygen originates from water splitting, not carbon fixation.
$O_2$ comes from $H_2O$, not from $CO_2$. Oxygen originates from water splitting, not carbon fixation.
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Which molecule is the immediate product of light reactions that directly powers carbon fixation steps?
Which molecule is the immediate product of light reactions that directly powers carbon fixation steps?
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ATP. Provides phosphate bond energy for biosynthetic reactions.
ATP. Provides phosphate bond energy for biosynthetic reactions.
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Which molecule carries high-energy electrons from light reactions to the Calvin cycle?
Which molecule carries high-energy electrons from light reactions to the Calvin cycle?
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NADPH. Transfers electrons from light reactions to carbon fixation.
NADPH. Transfers electrons from light reactions to carbon fixation.
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Identify the correct location for ATP synthase in chloroplasts in energy-flow models.
Identify the correct location for ATP synthase in chloroplasts in energy-flow models.
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Embedded in the thylakoid membrane. Enzyme spans the membrane to access proton gradient.
Embedded in the thylakoid membrane. Enzyme spans the membrane to access proton gradient.
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Which process directly builds the proton gradient: Calvin cycle or ETC activity in thylakoids?
Which process directly builds the proton gradient: Calvin cycle or ETC activity in thylakoids?
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Electron transport chain activity in thylakoids. ETC pumps protons to create the driving force.
Electron transport chain activity in thylakoids. ETC pumps protons to create the driving force.
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Find the correct pairing in a model: PSII with water splitting or PSI with water splitting?
Find the correct pairing in a model: PSII with water splitting or PSI with water splitting?
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PSII is linked to water splitting. PSII receives electrons from water oxidation.
PSII is linked to water splitting. PSII receives electrons from water oxidation.
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Which outcome indicates noncyclic electron flow is operating in a model?
Which outcome indicates noncyclic electron flow is operating in a model?
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Production of NADPH and release of $O_2$. Linear flow produces both reducing power and oxygen.
Production of NADPH and release of $O_2$. Linear flow produces both reducing power and oxygen.
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Which outcome indicates cyclic electron flow is operating in a model?
Which outcome indicates cyclic electron flow is operating in a model?
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ATP produced but no NADPH and no $O_2$. Circular flow generates only ATP without oxygen release.
ATP produced but no NADPH and no $O_2$. Circular flow generates only ATP without oxygen release.
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Identify the correct interpretation: increased proton gradient causes ATP to increase or decrease?
Identify the correct interpretation: increased proton gradient causes ATP to increase or decrease?
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ATP production increases. Stronger gradient drives more ATP synthesis.
ATP production increases. Stronger gradient drives more ATP synthesis.
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Which molecule is oxidized during the Calvin cycle to regenerate NADP$^+$ for light reactions?
Which molecule is oxidized during the Calvin cycle to regenerate NADP$^+$ for light reactions?
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NADPH is oxidized to NADP$^+$. Loses electrons to regenerate the oxidized form.
NADPH is oxidized to NADP$^+$. Loses electrons to regenerate the oxidized form.
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Identify the correct interpretation of NADPH in a model: energy carrier or structural carbohydrate?
Identify the correct interpretation of NADPH in a model: energy carrier or structural carbohydrate?
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Energy and electron carrier. NADPH stores and transfers both energy and electrons.
Energy and electron carrier. NADPH stores and transfers both energy and electrons.
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Choose the correct description of the Calvin cycle: produces ATP or consumes ATP?
Choose the correct description of the Calvin cycle: produces ATP or consumes ATP?
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Consumes ATP (and NADPH). Calvin cycle uses ATP rather than producing it.
Consumes ATP (and NADPH). Calvin cycle uses ATP rather than producing it.
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What is the correct matter-flow statement for carbon in photosynthesis models?
What is the correct matter-flow statement for carbon in photosynthesis models?
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Carbon atoms move from $CO_2$ into sugars. Carbon fixation transfers inorganic carbon to organic compounds.
Carbon atoms move from $CO_2$ into sugars. Carbon fixation transfers inorganic carbon to organic compounds.
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What is photophosphorylation?
What is photophosphorylation?
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ATP production powered by light-driven electron transport. Light energy drives phosphate addition to ADP.
ATP production powered by light-driven electron transport. Light energy drives phosphate addition to ADP.
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What form of energy enters a photosynthetic system from the environment?
What form of energy enters a photosynthetic system from the environment?
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Light energy (photons). Electromagnetic radiation provides the initial energy for photosynthesis.
Light energy (photons). Electromagnetic radiation provides the initial energy for photosynthesis.
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Which organelle is the main site of photosynthesis in plants and algae?
Which organelle is the main site of photosynthesis in plants and algae?
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Chloroplast. Double-membrane organelle specialized for photosynthetic reactions.
Chloroplast. Double-membrane organelle specialized for photosynthetic reactions.
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