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Photosynthesis
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Autotrophs and Heterotrophs
• Autotrophs are organisms that make their own food
• Heterotrophs are organisms that need to ingest food to obtain energy
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How are they related??
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Autotrophs
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Photosynthesis• How plants (and some other organisms) use
light to convert water and carbon dioxide into oxygen and sugar!
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• Happens here = chloroplast
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Leaf
Plant Cell
chloroplast
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Chloroplasts have chlorophyll (pigment)
This is why chloroplasts are green, why leaves are green
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Chloroplast
Lumen (inside thylakoid)
Outer membrane
intermembrane space
Inner membrane
Stroma
thlakoid
grana
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Photosynthesis
Light reactions
Dark Reactions
Photosystem II
Photosystem IIn thylakoid membrane
(aka… The Calvin Cycle)In stroma
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2 Photosystems in thylakoid
Light reactions
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Light reactionsIn thylakoid membrane
P680
photons
P680
ETR
ATP
P700
P700
ETR
ATP
Photosystem II Photosystem I
NADPH
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NOTE……
Electron Carriers are NADP …… b/c can become NADPH
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• Hydrogen ions flow through a channel in the thylakoid membrane
• ATP synthase attachedto the channel makesATP
How ATP made in light rxn?
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