Bioenergetics

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Bioenergetics
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Chloroplast Overview
Thylakoids Membrane discs arranged in stacks
(grana, sing. granum) which contain chlorophyll
and other important molecules. Site where solar
energy is trapped and converted into chemical
energy (light reactions). Thylakoid Membrane
Site of ATP synthesis. Stroma Thick fluid
outside thylakoid membranes, surrounded by
interior membrane. Site of sugar synthesis
(dark reactions).
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Photosynthesis Rxn Overview
Above, however, is a bit of a lie
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Photosynthesis Rxn Overview
Energy
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Light vs. Dark Reactions
Energy Reducing Power
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Light Reactions
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Light Reactions
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Light to Dark Reaction
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Why Plants are Green?
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Why Plants are Green?
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Chlorophyll
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Photosystems
energy transfer
energy transfer
energy transfer
energy transfer
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Regeneration of Photosystem II
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Cyclic Electron Flow
It turns out that more ATPs are needed by the
dark reactions than are provided by the light
reactions (at least as weve considered them so
far)
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Non-Cyclic Electron Flow
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Photophosphorylation
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Dark Reactions
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Photosynthesis Overview
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Link to Next Presentation
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Acknowledgements
http//207.233.44.253/wms/reynolmj/lifesciences/le
cturenote/bio3/Chap07.ppt http//207.233.44.253/wm
s/reynolmj/lifesciences/lecturenote/bio3/Chap08.pp
t