🔆 Light Reactions

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8th Grade Biology

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10 Terms

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Light reactions

First stage of photosynthesis that converts solar energy into ATP and NADPH

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Photosystem

Protein-pigment complex in thylakoid membrane that captures light energy

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Photosystem II

First photosystem that absorbs light and splits water

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Photosystem I

Second photosystem that re-energizes electrons

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Electron transport chain

Series of proteins that pass electrons and pump H⁺ ions

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ATP synthase

Enzyme that uses H⁺ flow to make ATP from ADP + P

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NADP⁺

Electron acceptor that becomes NADPH

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NADPH

Electron carrier molecule used in the Calvin cycle

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Photolysis

Splitting of water to release electrons, H⁺, and O₂

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O₂

By-product of water splitting in light reaction