Photosynthetic ET

Question 1

How many complexes are involved?

Answer 1

4

Question 2

In what order do these complexes work

Answer 2

Photosystem II
Cytochrome b6f
Plastocyanin
Photosystem I

Question 3

What does Photosystem II do?

Answer 3

Photon excited P680 to P680* & initiates et

Question 4

What does each photon in Photosystem II do?

Answer 4

oxidizes OEC

Question 5

What is the balanced reaction for Photosystem II?

Answer 5

H2O + PQ + 2H –> 1/2O2 + PQH2 + 2H

Question 6

What does cyt b6f do?

Answer 6

photo and oxidative phosphorylation of et chains

Question 7

What are the 2 cyt b6f paths?

Answer 7

1: PQH2 to PC lumen
2: PQH2 to Q stroma

Question 8

What is the cyt b6f balanced reaction?

Answer 8

2PQH2 + PQ + 2H + 2PCCu(II) –> 2PQ + 4H + PQH2 + 2PCCu(I)

Question 9

What does Plastocyanin do?

Answer 9

electron transport from cyt b6f to PS I via lumen-mobile metalloprotein

Question 10

What does Photosystem I do?

Answer 10

Photon excited P700 to P700*
P700+ then removed e from PC

Question 11

What is Photosystems I balanced reaction?

Answer 11

2PCCu(I) + 2FdFe(III) –> 2PCCu(II) + 2FdFe(II)

Question 12

what are the 2 oxidants in ferredoxin?

Answer 12

non-cyclic & cyclic

Question 13

non-cyclic?

Answer 13

electron delivered to ferredoxin

Question 14

cyclic?

Answer 14

electron returns to cyt b6f and reduces PQ to PQH2