Light Reaction

Question 1

Electron carries

Answer 1

Non protein cofactors that a there for reduction oxidation reactions. They are embedded in photosystem II, I, and the cytochrome complex.

Question 2

Electron carriers example

Answer 2

Cytochromes, quinones and iron sulfur centers

Question 3

Electron movement from photosystem II to the cytochrome

Answer 3

Facilitated by plastoquinone (PQ). Which serves the same function as ubiquinone

Question 4

Cytochromes to photosystem I

Answer 4

Linked by mobile copper containing the protein plastocyanin

Question 5

Ferredoxin

Answer 5

A protein that picks up the electrons from photosystem I

Question 6

NADP+ reductase

Answer 6

An enzyme that takes the electrons from ferredoxin and uses them to make NADPH using 2 electrons and 1 proton

Question 7

Electron flow

Answer 7

Easily oxidized to easily reduced. Except reactions centers start and are not easily oxidized

Question 8

How do photosystems I and II react

Answer 8

The raised electrons by the photons of light cause them to become P700* and P680* respectively

Question 9

P680+

Answer 9

Oxidized P680. It is reduced and donates and electron to water

Question 10

P700+

Answer 10

Reduced back to P700 from electrons from photosystem II

Question 11

ETC

Answer 11

Same as cellular respiration as a proton gradient across the thylakoid membrane forms

Question 12

Process 1 of the ETC

Answer 12

Proton translocated into the lumen by by red/ox of plastoquinone

Question 13

Process 2 of the ETC

Answer 13

2 protons added to the lumen by water being produced so the PQ can have more electrons.

Question 14

Process 3 of the ETC

Answer 14

Removal of protons from stroma when NADP+ becomes NADPH

Question 15

Proton motive force is established

Answer 15

Exact ATP synthase by chemiosmosis as cellular respiration

Question 16

Photophosphorlation

Answer 16

Using light to generate ATP

Question 17

Photosystem stoich

Answer 17

1 electron down the ETC needs 2 photons (1 for each photosystem

Question 18

Reduction reaction of water

Answer 18

2H2O — 4H+ 4 e- + O2

Question 19

Total number of photons needed for a glucose to be made

Answer 19

8

Question 20

Linear ET

Answer 20

Electron flow from photosystem 2– photosystem 1 to make MADPH

Question 21

Cyclic electron transport

Answer 21

Photosystem I functions without photosystem II

Question 22

How cyclic electron transport works

Answer 22

Reduced ferredoxin gives its electron back to plastoquinone pool. ATP is formed but NADPH is not

Question 23

Purpose of cyclic electron transport

Answer 23

Calvin cycle and other chloroplast functions needs more ATP than NADPH and is made here