Podcast
Questions and Answers
What is the primary role of the G3P molecules in the Calvin Cycle?
What is the primary role of the G3P molecules in the Calvin Cycle?
Which of the following pigments absorbs light in the blue and red parts of the visible spectrum?
Which of the following pigments absorbs light in the blue and red parts of the visible spectrum?
What is the purpose of the action spectrum in photosynthesis?
What is the purpose of the action spectrum in photosynthesis?
What is the primary function of accessory pigments in photosynthesis?
What is the primary function of accessory pigments in photosynthesis?
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Which of the following is NOT a type of pigment involved in photosynthesis?
Which of the following is NOT a type of pigment involved in photosynthesis?
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What is the function of chlorophyll in photosynthesis?
What is the function of chlorophyll in photosynthesis?
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Where do the light-dependent reactions occur?
Where do the light-dependent reactions occur?
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What is the purpose of the electron transport stage in the light-dependent reactions?
What is the purpose of the electron transport stage in the light-dependent reactions?
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What is the role of pigments such as chlorophyll in the light-dependent reactions?
What is the role of pigments such as chlorophyll in the light-dependent reactions?
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What is the product of the Calvin Cycle?
What is the product of the Calvin Cycle?
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What is the role of RuBisCO in the Calvin Cycle?
What is the role of RuBisCO in the Calvin Cycle?
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Study Notes
Light-dependent Reactions
- Occur in the thylakoid membranes of the chloroplast
- Light energy is absorbed by pigments and converted into ATP and NADPH
- Two stages:
- Light absorption: Light energy is absorbed by pigments such as chlorophyll and other accessory pigments
- Electron transport: Energy from light is used to generate a proton gradient, which drives the synthesis of ATP and NADPH
- Produces ATP and NADPH, which are used in the Calvin Cycle
Calvin Cycle
- Occurs in the stroma of the chloroplast
- Uses ATP and NADPH produced in the light-dependent reactions to convert CO2 into glucose
- Three stages:
- Carbon fixation: CO2 is fixed into a 3-carbon molecule using the enzyme RuBisCO
- Reduction: The 3-carbon molecule is reduced to form glyceraldehyde 3-phosphate (G3P) using ATP and NADPH
- Regeneration: The G3P molecules are used to regenerate the RuBP molecule, allowing the cycle to continue
- Produces glucose, which is used by the plant to fuel growth and development
Pigments and Chlorophyll
- Pigments: Molecules that absorb light energy and transfer it to the reaction centers
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Chlorophyll: The most important pigment in photosynthesis, responsible for absorbing light energy and transferring it to the reaction centers
- Chlorophyll a: Absorbs light in the blue and red parts of the visible spectrum
- Chlorophyll b: Absorbs light in the blue-violet part of the visible spectrum
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Accessory pigments: Pigments that absorb light energy and transfer it to chlorophyll
- Carotenoids: Absorb light in the blue and red parts of the visible spectrum
- Phycobiliproteins: Absorb light in the blue part of the visible spectrum
- Action spectrum: A graph showing the rate of photosynthesis at different wavelengths of light, peaking at the wavelengths absorbed by chlorophyll and other pigments
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Description
Understand the light-dependent reactions and Calvin cycle, including the role of pigments and chlorophyll in photosynthesis. Learn about the stages of carbon fixation, reduction, and regeneration in the Calvin cycle.
