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What is the primary function of Photosystem II in photosynthesis?
What is the primary function of Photosystem II in photosynthesis?
Photosystem I absorbs light energy after Photosystem II transfers the electrons.
Photosystem I absorbs light energy after Photosystem II transfers the electrons.
True
What molecule is produced by Photosystem I during photosynthesis?
What molecule is produced by Photosystem I during photosynthesis?
NADPH
Photosystem II splits a water molecule into oxygen, protons, and __________.
Photosystem II splits a water molecule into oxygen, protons, and __________.
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Match the following components of photosynthesis with their descriptions:
Match the following components of photosynthesis with their descriptions:
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Study Notes
Photosynthesis: The Light-Dependent Reactions
- Photosynthesis is a process used by plants to convert light energy into chemical energy stored in glucose.
- The light-dependent reactions occur in the thylakoid membranes of chloroplasts.
- These reactions involve two main photosystems: Photosystem II (PSII) and Photosystem I (PSI).
Photosystem II (PSII)
- PSII absorbs light energy, which excites electrons in chlorophyll molecules.
- The excited electrons are passed along an electron transport chain.
- Water molecules are split, releasing oxygen as a byproduct.
- The splitting of water also releases protons (H+) into the thylakoid lumen.
Electron Transport Chain
- The energized electrons from PSII move along the electron transport chain, releasing energy.
- This energy is used to pump protons from the stroma into the thylakoid lumen, creating a proton gradient.
Photosystem I (PSI)
- PSI also absorbs light energy, energizing its electrons.
- These energized electrons, along with those from PSII, are used to reduce NADP+ to NADPH.
- NADPH is an electron carrier that will be used in the Calvin cycle (light-independent reactions) for glucose synthesis.
Overall Process
- Light energy is absorbed by both PSII and PSI, driving the electron flow.
- The electron transport chain generates a proton gradient, which is used to produce ATP.
- ATP and NADPH are essential for the light-independent reactions.
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Description
Explore the intricacies of photosynthesis, focusing on the light-dependent reactions occurring in chloroplasts. Learn about the key components, including Photosystem II and I, and the role of the electron transport chain in generating energy and oxygen. This quiz will test your understanding of these essential biological processes.
