Chapter 8, Light Dependent Reaction (slides 31-46)

Question 1

Two major processes of photosynthesis reactions

Answer 1

• light dependent (energy-transduction)
• light independent (Carbon-fixation reactions)

Question 2

Light-dependent reaction have to do with

Answer 2

energy transfer

Question 3

In a light-independent reaction,

Answer 3

CO2 fixed to OR enzymatically combined with OR covalently bonded with RuBP

Question 4

Photolysis is process of

Answer 4

water molecules getting split

Question 5

Parts to light-dependent reactions are…(4)

Answer 5

• Noncyclic photophosphorylation
• Photolysis
• Chemiosmosis
• Cyclic Photophosphorylation

Question 6

Noncyclic photophosphorylation

Answer 6

energy/electron transfer –> NADPH

Question 7

Photolysis

Answer 7

splitting water

Question 8

Chemiosmosis

Answer 8

making ATP

Question 9

Cyclic Photophosphorylation

Answer 9

energy/electron transfer

Question 10

Formula for light-dependent reaction

Answer 10

Water + Light –> NADPH + Oxygen + ATP

Question 11

General step 1 of light-dependent reactions

Answer 11

• Light hits photosystem 1
• Transfers energy in photon to electron in one of pigment molecules

Question 12

(Step 1) electron are energized by energy being passed to _____

Answer 12

P700

Question 13

(Step 1) The P700 is the _______ ______

Answer 13

reaction center

Question 14

(Step 1) Reaction center passes electrons to ________ then ______ _______

Answer 14

Feridoxin then NADP+ Reductase

Question 15

(Step 1) NADP+ reduces it to _____

Answer 15

NADPH

Question 16

(Step 1) One problem is that…

Answer 16

photosystem 1 will eventually run out of electrons and shut down

Question 17

General Step 2 of light-dependent reactions

Answer 17

• light hits photosystem 2, transferring energy in photon to electron in pigment

Question 18

(Step 2) Energy passed to _____

Answer 18

P680

Question 19

(Step 2) The P680 is the ______ _____

Answer 19

reaction center

Question 20

(Step 2) P680 passes electron to ________ _____

Answer 20

Redox Chain

Question 21

(Step 2) Another name for Redox Chain

Answer 21

Electron Transport Chain

Question 22

(Step 2) then redox (electron transport) passes electrons to…

Answer 22

photosystem 1 to keep it going

Question 23

Step 3 is the _________ _______

Answer 23

Chemiosmotic Theory

Question 24

(Step 3) The Chemiosmotic Theory is electrons passing through _____ ______ used to pump __________ _______ from _______ into ______________ lumen

Answer 24

through REDOX CHAIN used to pump HYDROGEN IONS from STROMA to THYLAKOID lumen

Question 25

(Step 3) Hydrogen Ions diffuse _____ concentration gradient and pass through _____ ______

Answer 25

down, ATP Synthase

Question 26

(Step 3/4) When ions diffuse and pass through ATP synthase, that makes ___

Answer 26

ATP

Question 27

General step 4 is

Answer 27

ATP Synthase

Question 28

(Step 4) H+ ions diffuse back into the ______ through _____ _____ making ____

Answer 28

stroma, ATP Synthase, ATP

Question 29

ATP Synthase is a ________ protein

Answer 29

multimeric

Question 30

ATP Synthase ______ as H+ ions pass, coupling H+ flow with ____ ____________

Answer 30

rotates, ADP Phosphorylation

Question 31

ATP Synthase consists of...(3)

Answer 31

- base embedded in thylakoid membrane - rotating shaft - stationary head

Question 32

ATP Synthase shaft rotates as H+ ions pass between the ____ and ____ subunits in the base

Answer 32

a and c

Question 33

The rotation is ____ degrees

Answer 33

120

Question 34

The 120 degree rotation causes _______ changes in the head

Answer 34

conformational

Question 35

In the second, _____ and ____ are forced together, making ATP

Answer 35

ADP, Phosphate

Question 36

In the third, ____ is released

Answer 36

ATP

Question 37

Hydrogen Ion flow is _____ to ATP synthesis

Answer 37

coupled

Question 38

light absorbed by photosystem 2 is also used to _____ water, generating _____ ____

Answer 38

split, oxygen gas

Question 39

_______ are passed to photosystem 2 then _______ ________ ______

Answer 39

electrons, electron transport chain

Question 40

_______ _______ added to those electrons pumped into the thylakoid membrane

Answer 40

hydrogen ions

Question 41

Major products of Light dependent reactions

Answer 41

ATP, NADPH, Oxygen

Question 42

Cyclic photophosphorylation is different because... (3)

Answer 42

- photons energize electrons only in photosystem 1 (P700) - Electrons not passed to NADP+, but to extra Redox Chain - this is only to make ATP, no NADPH or Oxygen

Question 43

When H2O splits, created

Answer 43

2 electrons, 2H+, 1/2 O2

Question 44

Water splitting only happens in Photosystem

Answer 44

two

Question 45

non-cyclic produces

Answer 45

ATP and NADPH

Question 46

cyclic produces

Answer 46

just ATP (photosystem one)

Question 47

electrons travel from _____ to _____ energy states

Answer 47

higher to lower