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Questions and Answers
What is the primary function of chlorophyll in photosynthesis?
What is the primary function of chlorophyll in photosynthesis?
Which of the following processes occurs during the light reactions of photosynthesis?
Which of the following processes occurs during the light reactions of photosynthesis?
In cyclic electron flow, which Photosystem is utilized?
In cyclic electron flow, which Photosystem is utilized?
During the Calvin Cycle, which step involves the addition of CO2 to RuBP?
During the Calvin Cycle, which step involves the addition of CO2 to RuBP?
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What is the end product of the Calvin Cycle after reduction?
What is the end product of the Calvin Cycle after reduction?
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What is produced as a result of cyclic electron flow?
What is produced as a result of cyclic electron flow?
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Which component is regenerated during the Calvin Cycle to continue the process?
Which component is regenerated during the Calvin Cycle to continue the process?
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What is the primary purpose of the light reactions in photosynthesis?
What is the primary purpose of the light reactions in photosynthesis?
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Which molecule is produced during the light reactions and is used in the Calvin Cycle?
Which molecule is produced during the light reactions and is used in the Calvin Cycle?
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Which of the following correctly describes cyclic electron flow?
Which of the following correctly describes cyclic electron flow?
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Study Notes
Photosynthesis Introduction
- Autotrophs use chlorophyll to harvest solar energy, storing it in ATP and carbohydrates.
- In eukaryotes, chlorophyll is within chloroplast thylakoid membranes.
- Photosynthesis involves three key processes:
- Light-dependent reactions (energy absorption from sunlight)
- Light-dependent reactions (reactivation of reaction center)
- Dark reactions (carbohydrates production via carbon fixation)
Photosynthesis Chemical Reaction
- 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
- Carbon dioxide + Water → Glucose + Oxygen
- This is the overall chemical reaction for photosynthesis
Photosynthesis During Photosynthesis
- Energy from sunlight drives glucose synthesis from CO₂ and H₂O.
- Sunlight's energy is converted into a usable form (potential)
Stages of Photosynthesis - Light Reactions
- Use sunlight to reduce NADP+ to NADPH and split water, releasing oxygen.
- ATP is formed (phosphorylation) by the movement of hydrogen ions.
- Happen in the thylakoids of the chloroplast
Stages of Photosynthesis - Calvin Cycle
- Also called dark reactions, doesn't require direct light energy.
- CO₂ is incorporated into organic molecules (carbon fixation)
- NADPH and ATP are used to produce carbohydrates from fixed carbon.
- Occurs in the chloroplast stroma.
- ADP, inorganic phosphate, and NADP+ are returned to the light reactions
Light Reactions Events
- Light energy excites chlorophyll electrons from Photosystem II to a higher energy level.
- Electrons are passed through electron transport chains, releasing energy to pump H+ into the thylakoid space.
- H+ ions flow through ATP synthase, producing ATP.
- Electrons are passed to Photosystem I, then to NADP+ to produce NADPH.
Cyclic Electron Flow
- An alternative electron pathway, where electrons from Photosystem I return to the electron transport chain.
- This route produces ATP but not NADPH.
Calvin Cycle - Carbon Fixation
- CO₂ is incorporated into RuBP (ribulose biphosphate), a 5-carbon sugar.
- This reaction is catalyzed by RuBisCO (ribulose-1,5-bisphosphate carboxylase/oxygenase).
- RuBisCO is one of the most common proteins on Earth.
- The resulting product (6-carbon molecule) is unstable and immediately splits into 2 molecules of 3-phosphoglycerate (3-carbon molecule).
Calvin Cycle - Reduction
- A phosphate group from ATP is added to 3-phosphoglycerate, forming 1,3-biphosphoglycerate.
- NADPH reduces 1,3-biphosphoglycerate to G3P (glyceraldehyde-3-phosphate).
- G3P molecules are the building blocks for glucose (or other sugars).
Calvin Cycle - Regeneration
- Five out of six G3P molecules are used to regenerate RuBP, requiring ATP.
- The regeneration of RuBP allows the Calvin cycle to continue.
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Description
Explore the fascinating process of photosynthesis through various stages and chemical reactions. This quiz covers the light-dependent and dark reactions, the role of chlorophyll, and the overall chemical equation involved. Test your knowledge on how plants convert sunlight into energy and produce oxygen.
