4.3 Photosynthesis in Detail
4.3 Photosynthesis in Detail
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
4.3 Photosynthesis in Detail
The first stage of photosynthesis captures and transfers energy.
? The light-dependent reactions include groups of molecules called photosystems.
4.3 Photosynthesis in Detail
? Photosystem II captures and transfers energy.
? chlorophyll absorbs energy from sunlight
? energized electrons enter electron transport chain
? water molecules are split
? oxygen is released as waste
? hydrogen ions are transported across thylakoid membrane
4.3 Photosynthesis in Detail
? Photosystem I captures energy and produces energycarrying molecules.
? chlorophyll absorbs energy from sunlight
? energized electrons are used to make NADPH
? NADPH is transferred to light-independent reactions
4.3 Photosynthesis in Detail
? The light-dependent reactions produce ATP. ? hydrogen ions flow through a channel in the thylakoid membrane ? ATP synthase attached to the channel makes ATP
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