Announcements, March 12 • Please remove homework from folders • One homework and 2 quizzes (Q14, Q18) without names still unclaimed – please see me to claim. • Reading for today: pp. 288-302 on photosynthesis; pp. 302-307 will not be covered due to snow day. • Review Session from 4-5 PM, March 13 in BR 203 • Exam 2 on Wednesday, March 14 over the same material as before. • Reading for Friday, March 16: pp. 318-358 on intracellular trafficking
Announcements, March 12. Please remove homework from folders One homework and 2 quizzes (Q14, Q18) without names still unclaimed – please see me to claim. Reading for today: pp. 288-302 on photosynthesis; pp. 302-307 will not be covered due to snow day. - PowerPoint PPT Presentation
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Announcements, March 12
• Please remove homework from folders• One homework and 2 quizzes (Q14, Q18) without names
still unclaimed – please see me to claim.• Reading for today: pp. 288-302 on photosynthesis; pp.
302-307 will not be covered due to snow day.• Review Session from 4-5 PM, March 13 in BR 203• Exam 2 on Wednesday, March 14 over the same
material as before.• Reading for Friday, March 16: pp. 318-358 on
intracellular trafficking
Chloroplast Ultrastructure
Photosynthesis Overview
• Light + 3 CO2 + 6 H2O → C3H6O3 + 3 O2 + 3 H2O
• Function: ATP synthesis and synthetic rxns• Energy source: sunlight• Energy conversion:
– solar H+ gradient ATP
– H2O electron transport NADPH
• Carbon source: CO2
• Electron source: H2O
• Intermediate electron acceptor: NADP+
• Byproduct: O2
Reduced C:3C sugar
Energy Transduction reactions:Photoreduction (NADPH synthesis)
Photophosphorylation (ATP synthesis)
NADP+ and NADPH
Carry e- in syntheticreactions, whereasNAD+/NADP usedin degradative rxns.
Absorption spectra of plant pigments
Chlorophyll
Chlorophyll is special because it can accept a low energy electron and donate
a high energy electron.
Light Harvesting Complex
1. Heat,light2.
3.
Fate of light energy when e* eo
1. Energy is lost as heat and lower energy light.
2. Resonance energy transfer to an electron in an adjacent pigment molecule.
3. Photochemical reduction, where e* is itself transferred to a carrier (only in reaction center chlorophyll).
Resonance Energy Transfer to Adjacent Pigments
e*
eo
e*
eo
e*
eo
e*
eo
Antenna chlorophyllsReaction center
chlorophyll P680PSII
Groundstate
Excitedstate
photon
Photochemical Reduction:e* is transferred to NADP+