ELECTRON TRANSPORT

Question 1

Photosystem

Answer 1

light-harvesting complex and reaction center

Question 2

Light-harvesting complex

Answer 2

pigments molecules bonded to proteins

Question 3

Reaction center

Answer 3

special pair of chlorophyll a
electron acceptor

Question 4

Location of PSII and PSI

Answer 4

Thylakoid membranes

Question 5

Z-scheme

Answer 5

cooperation of PSII and PSI in the transfer of electrons from water to NADP+

Answer 6

Proton hits chlorophyll (excited) and then loss electron (oxidized chlorophyll) (ground state) H+ and O2

Question 7

PSII

Answer 7

P680+ is strong oxidant
strong enough to pull electrons from H2O

Question 8

PSI

Answer 8

P700 is strong reductant
strong enough to donate electrons to NADP+

Question 9

Special pair of chlorophyll a

Answer 9

P680 and P700

Question 10

What connects PSI and PSII

Answer 10

electron transport chain

Question 11

Plastoquinone (PQ)

Answer 11

small molecule and mobile electron carrier (chemical)
PSII to Cyt bef

Question 12

Plastocyanin (PC)

Answer 12

small protein and mobile electron carrier
Cyt bef to PSI

Question 13

Linear electron transport

Answer 13

PSII –> Cyt bef –> PSI

Question 14

LCH complex

Answer 14

PSII surrounded by LCHII complex
PSI surrounded by LCHI complex

Question 15

Oxygen evolving complex*

Answer 15

PSII luminal surface
generates O2
Mn

Question 16

nutrients*

Answer 16

Nitrogen and magnesium- chlorophyll synthesis
Mn- oxygen evolving complex
Fe- enzyme activity in chlorophyll synthesis and

Question 17

Electron transfer in PSII

Answer 17

Light converts reaction chlorophyll P680 to P680
Electron leaves P680 forming P680+
The electron is transferred to Pheophytin forming Pheo-
Pheo- passes electron to Qa to produce Qa-
Qa- passes the electron to Qb to produce Qb-

Question 18

First electron acceptor in PSII*

Answer 18

Pheophytin

Question 19

Plastoquinone –> plastoquinol

Answer 19

PQ2- binds to protons from the stroma to from PQH2

Question 20

First half Q cycle

Answer 20

PQH2 delivers two protons (H+) to lumen*, one electron to PC. PQ returns to PSII

Question 21

Second half Q cycle

Answer 21

another PQH2 delivers two protons to lumen, one electron to PC. PQ, two electrons and two protons regenerate PQH2 which cycles agin

Question 22

Ferrodoxin*

Answer 22

transfers electrons via ferredoxin: NADP+ reductase (FNR)
NADP+ and NADPH

Question 23

ATP synthase

Answer 23

movement of protons form inside the lumen to the stroma across the thylakoid membrane
Synthesis of ATP from ADP and Pi

Question 24

Appressed thylakoids

Answer 24

PSII mainly found in appressed regions
Cyt b6f

Question 25

Non-appressed thylakoids

Answer 25

ATP synthase and PSI
Cyt b6f