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photosynthesis
light-driven electron flow
4
Biology
Undergraduate 3
06/15/2013
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Term
Draw Photosystems, describe cyclic and non cyclic e- flow
 Definition

PSII: 1)water oxidation/P680->P680* 2)Pheophytin 3)PQa =Plastoquinone 4) PQb = second quinone 5) Cytochrome b6f complex ->Plastocyanin

PSI: 1) Plastocyanin ->P700-P700* 2)Ao = electron acceptor chorlophyl 3) A1 = phylloquinone 4) Fe-S 5) ferredoxin 6) Fd:NADP+ reductase NADP+ -> NADPH

Cyclic: ferrodoxin can pass e- back to cyt b6f instead of reducing NADP+, generates more ATP, but less NADPH.

 

 

[image]
Term
chorophyll a vs chlorophyll b
 Definition

Chloro A = red/orange ~680 nm

Chloro B = blue/violet ~460 nm
Term
Photosystem II vs. I in terms of chlorophyll types
 Definition

Photo II has 50/50 chrolophyll a/b

Photo I has more chlorophyll a
Term
Z scheme equation stoichiometry
 Definition
2H20 + 2NADP+ + 8 H+ =>O2 + 2NADPH + 2H+
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