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Photosynthesis Chapter 10 PowerPoint Presentation
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Photosynthesis Chapter 10 - PowerPoint PPT Presentation


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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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Presentation Transcript
slide1

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

slide7

Pigments absorb across specific wavelengths.

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)

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PS I 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.H2O ½O2 + 2H+ + 2e-2H2O O2 + 4H+ + 4e-
calvin cycle has three main parts carboxylation reduction regeneration
Calvin cycle has three main parts: Carboxylation Reduction Regeneration
3 ribulose 1 5 bisphosphate 3 co 2 3 ribulose 1 5 bisphosphate glyceraldehyde 3 phosphate
3 Ribulose-1,5-bisphosphate + 3 CO23 Ribulose-1,5-bisphosphate + Glyceraldehyde-3-phosphate

Summary

Fixation of 1 CO2 molecule requires 3 ATP + 2 NADPH