Questions and Answers
What are the starting components for photosynthesis?
What does Photosystem 2 start with?
What does Photosystem 1 produce?
Photosystem 2 ends with oxygen and ATP.
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What process pulls hydrogen into the thylakoid against their concentration gradient in Photosystem 2?
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Photosynthesis takes place in the chloroplast.
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What molecules are produced during photosynthesis?
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Why do plants use accessory pigments in photosynthesis?
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Photosystems 1 and 2 are ______ processes that pull energy from the sun.
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Where do the Calvin Cycle reactions occur?
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During photosystem 2, light hits a pigment in the thylakoid, passing ______ to another pigment until it reaches p680.
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How is the electron from p680 replaced during photosystem 2?
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What happens to the electron from p700 in photosystem 1?
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Study Notes
Photosystem II
- Initiates the photosynthetic process with water and sunlight.
- Produces oxygen and ATP as end products.
- Occurs in thylakoid membranes of chloroplasts.
- Sunlight energy excites an electron within a pigment, starting the electron transport chain.
- Splits water molecules, releasing oxygen in the process.
- Utilizes active transport to pull hydrogen ions into the thylakoid against their concentration gradient.
- Energy transfer occurs as light hits the pigments, moving from one to another until reaching P680.
Photosystem I
- Utilizes energy from sunlight to synthesize NADPH.
- Aims to capture solar energy efficiently to create NADPH.
- Operates alongside Photosystem II, both are endergonic and draw energy from the sun.
- Receives an electron from Photosystem II to replenish its P700 electron.
Photosynthesis Overview
- Takes place in chloroplasts, specifically within thylakoids and stroma.
- Starting materials include water and carbon dioxide.
- Produces ATP and NADPH during the light-dependent reactions.
- The Calvin Cycle requires carbon dioxide and is driven by ATP and NADPH generated in Photosystems I and II.
Accessory Pigments
- Essential for maximizing light absorption, capturing wavelengths that chlorophyll cannot absorb.
Energy Transformation
- Solar energy converted into chemical energy stored in glucose, with some energy lost in the process.
- Process is efficient in harnessing energy to support plant growth and metabolism.
Studying That Suits You
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Description
Test your knowledge of Photosystem 1 and 2 with these flashcards. Each card outlines key concepts from the processes involved in photosynthesis, including how these systems start and end their reactions. Perfect for students looking to strengthen their understanding of plant biology.
