- Stroma: is the cytoplasm inside of the chloroplast
- Chlorophyll: absorbs blue light
> inside of thylakoid
def: 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
Lumen: 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 #
absorbs 680 nm
H2O is oxidized
generates H+ gradient
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.