BIS 103: Photosynthesis II

Question 1

What species makes a proton gradient?

Answer 1

cyt bc1/ cty b6f

Question 2

Where does water enter from to be broken? N/P?

Answer 2

Lumen - p side

Question 3

e- progression in photosystem II P680 (first)

Answer 3

2H20
Mn4CaO5 complex
Tyrosine free radical
Pg680
pheophytin 
PQa&b

Question 4

PHeophytin structure

Answer 4

chyl without Mg ion

Question 5

plastoquinone A/b - which mobile?

Answer 5

B - stuck in thylakoid membrane like Complex 3

Question 6

Best oxidizing agent

Answer 6

p680 - need e- reduced

Question 7

analogous to cytc - difference?

Answer 7

plastocyanin- but with Cu

Question 8

mobile e- carriers of photosynthesis

Answer 8

plastoquinone B, plastocyanin, ferrodoxin

Question 9

use of Mn4CaO5

Answer 9

has several oxid site -

ground state - loses 4e- -> +4

Question 10

How does plastoquinone transfer e- to others?

Answer 10

Q cycle - PQH2 drops 2H+, 1e- to self, 1e- to ultimately plastocyanin

Question 11

plastoquinone structure

Answer 11

9 isoprenes, aromatic for stabil/react (no alcohols)

Question 12

What’s the ferry between photosystem 1 and 2?

Answer 12

plastocyanin

Question 13

what enzyme makes NADPH?

Answer 13

Fd:NAD oxidoreductase

Question 14

What side does plastocyanin reside?

Answer 14

lumen p side

Question 15

for 1 oxygen,
use _photons
make _NADPH
make _ATP

Answer 15

8 photons
2 NADPH
3 ATP

Question 16

how many photons per e-

Answer 16

2