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Bio ch04 3
1. 4.3 Photosynthesis in Detail
KEY CONCEPT
Photosynthesis requires a series of chemical
reactions.
2. 4.3 Photosynthesis in Detail
The first stage of photosynthesis captures and transfers
energy.
โข The light-dependent
reactions include groups
of molecules called
photosystems.
3. 4.3 Photosynthesis in Detail
โข Photosystem II captures and transfers energy.
โ chlorophyll absorbs
energy from sunlight
โ energized electrons
enter electron
transport chain
โ water molecules are
split
โ oxygen is released as
waste
โ hydrogen ions are
transported across
thylakoid membrane
4. 4.3 Photosynthesis in Detail
โข Photosystem I captures energy and produces energy-
carrying molecules.
โ chlorophyll absorbs
energy from sunlight
โ energized electrons
are used to make
NADPH
โ NADPH is transferred
to light-independent
reactions
5. 4.3 Photosynthesis in Detail
โข The light-dependent reactions produce ATP.
โ hydrogen ions flow through a channel in the thylakoid
membrane
โ ATP synthase attached to the channel makes ATP
6. 4.3 Photosynthesis in Detail
โข Light-independent
reactions occur in the
stroma and use CO2
molecules.
The second stage of photosynthesis uses energy from
the first stage to make sugars.
7. 4.3 Photosynthesis in Detail
โข A molecule of glucose is formed as it stores some of the
energy captured from sunlight.
โ carbon dioxide molecules enter the Calvin cycle
โ energy is added and carbon molecules are rearranged
โ a high-energy three-carbon molecule leaves the cycle
8. 4.3 Photosynthesis in Detail
โ two three-carbon molecules bond to form a sugar
โ remaining molecules stay in the cycle
โข A molecule of glucose is formed as it stores some of the
energy captured from sunlight.