Electron Transport Chain

Question 1

Where is the electron transport chain

Answer 1

Granal thylakoid membrane

Question 2

Electrons are excited from which molecule

Answer 2

Pigment molecule e.g. chlorophyll

Question 3

What is the order of the ETC

Answer 3

PSII - phenophytin - plastoquinone - cytochrome b6f - plastocyanin - PSI

Question 4

What wavelength is light best absorbed at in photosytem II

Answer 4

680

Question 5

Which photosytem is larger

Answer 5

1

Question 6

What happens at photosytem I

Answer 6

Electron re-excited and moves to electron acceptor molecule ferrodoxin

Question 7

What happens at ferredoxin

Answer 7

Acted on by enzyme FNR and energy used to convert NADP+ to NADH

Question 8

Which thylakoid membrane protein synthesises ATP

Answer 8

ATP synthase

Question 9

How does ATP synthase use H+ ions

Answer 9

Moves from lumen into stroma down concentration gradient

Combines ADP + Pi

Question 10

What is the equation for photolysis

Answer 10

2 H2O —> O2 + 4H+ + 4e-

Question 11

Which pigment molecules in the ETC pump H+ ions into the thylakoid lumen

Answer 11

Plastoquinone and cytochrome b6f

Question 12

What happens in cyclic electron transport

Answer 12

Electron excited from ferredoxin to cytochrome b6f to move more H+ ions and produce more ATP

Question 13

When does cyclic electron transport occur

Answer 13

In stressful situations