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Zachariah Wheeler
I'm a bit confused about the light-dependent reactions. I understand they happen in the thylakoid membrane, but I'm not sure about the specific steps and how energy is transferred. Can you clarify?
Elissa Patrick
I think this is related, but I'm not 100% sure.
Lori Cantrell
Great question! Let me break it down visually.
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Gerald Yoder
So the energy is basically being transformed from light to chemical energy?
Lori Cantrell
Exactly!
Electron_Transport_Chain_Diagram.pdf
Gerald Yoder
Oh, now I see how the energy transfers step by step!
Zachariah Wheeler
Wait, so what exactly happens to those excited electrons? Do they just go back to their original state?
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Created about 3 hours ago
Light-dependent reactions
PSII absorbs a photon to produce a so-called high energy electron which transfers via an electron transport chain to cytochrome b6f and then to PSI. The then-reduced PSI, absorbs another photon producing a more highly reducing electron, which converts NADP+ to NADPH. In oxygenic photosynthesis, the first electron donor is water, creating oxygen (O2) as a by-product. In anoxygenic photosynthesis, various electron donors are used. Cytochrome b6f and ATP synthase work together to produce ATP (photophosphorylation) in two distinct ways. In non-cyclic photophosphorylation, cytochrome b6f uses electrons from PSII and energy from PSI[citation needed] to pump protons from the stroma to the lumen. The resulting proton gradient across the thylakoid membrane creates a proton-motive force, used by ATP synthase to form ATP. In cyclic photophosphorylation, cytochrome b6f uses electrons and energy from PSI to create more ATP and to stop the production of NADPH. Cyclic phosphorylation is important to create ATP and maintain NADPH in the right proportion for the light-independent reactions.
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Calculus and Analytical Geometry
MATH 141-A · 001
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