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Biology 224 > Chapter 8, Light Dependent Reaction (slides 31-46) > Flashcards

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

1
Q

Two major processes of photosynthesis reactions

A
  • light dependent (energy-transduction)
  • light independent (Carbon-fixation reactions)
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2
Q

Light-dependent reaction have to do with

A

energy transfer

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3
Q

In a light-independent reaction,

A

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

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4
Q

Photolysis is process of

A

water molecules getting split

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5
Q

Parts to light-dependent reactions are…(4)

A
  • Noncyclic photophosphorylation
  • Photolysis
  • Chemiosmosis
  • Cyclic Photophosphorylation
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6
Q

Noncyclic photophosphorylation

A

energy/electron transfer –> NADPH

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7
Q

Photolysis

A

splitting water

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8
Q

Chemiosmosis

A

making ATP

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9
Q

Cyclic Photophosphorylation

A

energy/electron transfer

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10
Q

Formula for light-dependent reaction

A

Water + Light –> NADPH + Oxygen + ATP

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11
Q

General step 1 of light-dependent reactions

A
  • Light hits photosystem 1
  • Transfers energy in photon to electron in one of pigment molecules
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12
Q

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

A

P700

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13
Q

(Step 1) The P700 is the _______ ______

A

reaction center

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14
Q

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

A

Feridoxin then NADP+ Reductase

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15
Q

(Step 1) NADP+ reduces it to _____

A

NADPH

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16
Q

(Step 1) One problem is that…

A

photosystem 1 will eventually run out of electrons and shut down

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17
Q

General Step 2 of light-dependent reactions

A
  • light hits photosystem 2, transferring energy in photon to electron in pigment
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18
Q

(Step 2) Energy passed to _____

A

P680

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19
Q

(Step 2) The P680 is the ______ _____

A

reaction center

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20
Q

(Step 2) P680 passes electron to ________ _____

A

Redox Chain

21
Q

(Step 2) Another name for Redox Chain

A

Electron Transport Chain

22
Q

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

A

photosystem 1 to keep it going

23
Q

Step 3 is the _________ _______

A

Chemiosmotic Theory

24
Q

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

A

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

25
Q

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

A

down, ATP Synthase

26
Q

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

A

ATP

27
Q

General step 4 is

A

ATP Synthase

28
Q

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

A

stroma, ATP Synthase, ATP

29
Q

ATP Synthase is a ________ protein

A

multimeric

30
Q

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

A

rotates, ADP Phosphorylation

31
Q

ATP Synthase consists of…(3)

A
  • base embedded in thylakoid membrane
  • rotating shaft
  • stationary head
32
Q

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

A

a and c

33
Q

The rotation is ____ degrees

A

120

34
Q

The 120 degree rotation causes _______ changes in the head

A

conformational

35
Q

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

A

ADP, Phosphate

36
Q

In the third, ____ is released

A

ATP

37
Q

Hydrogen Ion flow is _____ to ATP synthesis

A

coupled

38
Q

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

A

split, oxygen gas

39
Q

_______ are passed to photosystem 2 then _______ ________ ______

A

electrons, electron transport chain

40
Q

_______ _______ added to those electrons pumped into the thylakoid membrane

A

hydrogen ions

41
Q

Major products of Light dependent reactions

A

ATP, NADPH, Oxygen

42
Q

Cyclic photophosphorylation is different because… (3)

A
  • 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
43
Q

When H2O splits, created

A

2 electrons, 2H+, 1/2 O2

44
Q

Water splitting only happens in Photosystem

A

two

45
Q

non-cyclic produces

A

ATP and NADPH

46
Q

cyclic produces

A

just ATP (photosystem one)

47
Q

electrons travel from _____ to _____ energy states

A

higher to lower

48
Q
A

Biology 224 (18 decks)

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