AP Biology - Photosynthesis (Part 1

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Transcript of AP Biology - Photosynthesis (Part 1

  • 1.Photosynthesis
    The Process That Feeds the Biosphere

2. Terminology
Heterotrophs
Photoautotrophs
3. Important Structures
Chloroplast
Chlorophyll (pigment)
Stomata
Thylakoid
Grana
Stroma
4. Photosynthesis
CO2+H2O+lightC6H12O6+O2
5. Photosynthesis
Organisms split water as a source of electrons, then release O2
Electrons reduce CO2 to sugars (increase in G requires energy)
6. Two Stages
Light Reactions
Light absorbed creates NADPH
Water split
ATP produced
Photophosphorylation
Thylakoids
Calvin Cycle
Carbon fixation
Uses NADPH and ATP
Stroma
7. Light
Visible wavelengths drive photosynthesis
Chlorophyll a and chlorophyll b absorb different wavelengths
Carotenoids= photoprotection
8. Photosystems
Pigments and proteins
Absorbed energy funneled to reaction center
Photosystems II and I absorb different wavelengths of light
9. Non-cyclic Electron Flow
PS II electron excited to PEA
Water split to replace lost electrons (O2 formed)
Electron passed down ETC to PS I, providing energy for ATP
Repeat process in PS I
NADP+ reduced by 2 e- to NADPH
10. Non-cyclic Electron Flow
11. Cyclic Electron FLow
No use of PS II
Rise in NADPH levels triggers cyclic flow that creates only ATP
12. Electron Transport / ATP Synthesis
DIFFERENCES:

  • Where electrons come from

13. H+ reservoir areaSimilar proton-motive force in chloroplasts