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- - 2 membranes
- > inner membrane
- > outer membrane
is the cytoplasm inside of the chloroplast
- - Chlorophyll: absorbs blue light
- > inside of thylakoid
disk shape, membranous sac in chloroplast
- - each disk is called granum
- > pigments around absorb diff. wave lenghts
- - contains pigments
- > some of them arranged into photocentres
space inside of the granum
Biomas in Photosynthetic organism
- - comes mostly from atmospheric CO2
- >minerals absorbed through plant tissues
Chlorophylls absorb photons
- Chlorophyll A: plants, cyanobacteria
- > convert light energy to chemical energy
- Chlorophyll B: accessory pigment
- > absorbs photons of different energy than A
- short wavelength = higher energy photons
- long wavelength = low energy photons
Photosynthesis can be divided into light-dependent and light-independent reactions.
n= represents any #
- chlorophyll A
- absorbs 680 nm
- H2O is oxidized
- generates H+ gradient
- chlorophyll A
- absorbs 700
- reduces NADP+
- ATP is produced
Whats happening in PSII
- Light strikes chlorophyll in the antenna complex.
- Pigment molecules in the antenna complex transmit energy to each other.
- Once energy is transmitted to the reaction center P680 chlorophyll A, an e- is raised to a higher valence shell. This e- is donated to quinone (bcomes reduces)
- Water oxidized in the reaction center P680 chlorophyll A.The e- in the quinone is transmitted to b6f.
- b6f grabs H+ from stroma and pump it into the lumen. The H+ pump in goes to the ATP synthase.
- The e- in b6f is transmitted to the cyanin where it waits to the photon 700 to give to the next pump an electron that is transmitted further in PSI. Then the e- in b6f enters to the next pump.
What's happening in PSI
- Photon 700nm (light energy) hits the chlorophyll, an e- is raised to higher valence shell and the e- is donated to the Ferredoxin. After this donation occur the e- waiting in PSII is then transmitted to the chlorophyll. The e- in ferredoxin (Fd) then is transmitted to the reaction centre.
- In the reaction centre the e- reduce NADP giving NADPH.
- ATP synthase is side to the reaction centre.
Light-dependent reactions (PSI)
Uses e- from PSII to reduce reaction centre absorbs lower-energy photons, uses energy to drive NADPH production in the stroma
Light-dependent reactions (PSII)
- Uses e- from H2O to reduce reaction centre.
- Absorbs higher-energy photons, uses energy to create a proton gradient to drive ATP synthesis.
- Both PS are interlinked and both require light.
- End result: ATP and NADPH produced in the chloroplast stroma, O2 produced from H2O
- Glucose is the high energy molecule @end of photosynthesis.
- e- is energized in the reaction centre.
- ATP n NADPH made during light reactions
- Cellular respiration starts w the end product of photosynthesis(NADPH n O2).