Light Rxns Flashcards
1
Q
Occur where
A
thylakoid membrane
2
Q
require what
A
chlorophyll to convert light energy to electrical energy
3
Q
rxn 1
A
In: e- from H20 turn go to PlastoquinonePQ(o)
Out: 1/2 O2 + PQH2(r)
Products: 2 photons–>
Enzyme: Photo-system 2
4
Q
rxn 2
A
In: PQH2(r) + 2PC(o)
Out: PQ(o) + 2PlastocyninPC(r)-proton carrier
Products: 4H+(stroma)–>4H+lumin
Enzyme: Cytochrome bf
5
Q
rxn 3
A
In: 2 PC(r) + 2Fd(o)
Out: 2PC(o) + 2Ferridoxin-protein electron carrier
Products: 2 photons–>
Enzyme: Photosytem 1
6
Q
rxn 4
A
In: 2Fd(r)
Out: 2Fd(ox)
Products: NADP+—>NADPH
Enzyme: Ferredoxin Reductase
7
Q
Last step
A
- after build up of H+ and NADPH
- H+ gradient –> ATP synthesis
8
Q
Overall:
A
H2O + NADP+ –>4 photons, 7 H+, 1.5 ATP–> 1/2 O2+ NADPH
9
Q
electron carriers
A
- 2Plastocyanin(r) PC: 1 electron carrier(step 2)
- 2Ferredoxin(r)Fd: 1 electron carrier (step3)
10
Q
absorb light
A
- step 1: 2 photons
- step 3: 2 photons
11
Q
NADPH formed
A
step 4
