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Photosynthesis Chapter 10. Photosynthesis occurs in the chloroplast. Chloroplast = type of plastid. Proplastid Chloroplasts Chromoplasts Amyloplasts. When photosynthetic pigments absorb photons, four things can happen:. Photon re-emission (fluorescence) Heat generation

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Photosynthesis

Chapter 10


Photosynthesis occurs in the chloroplast
Photosynthesis occurs in the chloroplast.

Chloroplast = type of plastid

Proplastid

Chloroplasts

Chromoplasts

Amyloplasts


When photosynthetic pigments absorb photons four things can happen
When photosynthetic pigments absorb photons, four things can happen:

Photon re-emission (fluorescence)

Heat generation

Energy transfer (resonance transfer)

Photochemistry


Pigments absorb across specific wavelengths. happen:

Absorption Spectrum

Multiple pigments allow more light to be harvested.



Two types of antenna complexes with distinct reaction centers
Two types of antenna complexes with distinct reaction centers:

RC absorbs at 700 nm (PS I)

RC absorbs at 680 nm (PS II)


PS I centers: Involved with the reduction of NADPH for use in carbohydrate synthesisPS II Involved with ATP synthesis for use in carbohydrate production

Two Distinct Photosystems



Electrons come from the splitting of water h 2 o o 2 2h 2e 2h 2 o o 2 4h 4e
Electrons come from the splitting of water. centers:H2O ½O2 + 2H+ + 2e-2H2O O2 + 4H+ + 4e-




Photophosphorylation summary ps ii 4 photons 2 atp ps i 4 photons 2 nadph
Photophosphorylation Summary centers:PS II 4 photons ~2 ATP PS I 4 photons 2 NADPH



Melvin Calvin centers:


Process of co 2 fixation calvin cycle the calvin cycle takes place in the chloroplast stroma
Process of CO centers:2 fixation = Calvin CycleThe Calvin cycle takes place in the chloroplast stroma.


Calvin cycle has three main parts carboxylation reduction regeneration
Calvin cycle has three main parts: centers: Carboxylation Reduction Regeneration



Ribulose 1 5 bisphosphate carboxylase oxygenase rubisco 1 8 1 4 total leaf protein
Ribulose-1,5-bisphosphate carboxylase/oxygenase centers:(Rubisco)1/8 - 1/4 total leaf protein



3 ribulose 1 5 bisphosphate 3 co 2 3 ribulose 1 5 bisphosphate glyceraldehyde 3 phosphate
3 Ribulose-1,5-bisphosphate + 3 CO centers:23 Ribulose-1,5-bisphosphate + Glyceraldehyde-3-phosphate

Summary

Fixation of 1 CO2 molecule requires 3 ATP + 2 NADPH


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