1. photosynthesis
TRANSCRIPT
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PHOTOSYNTHESIS
I. Metabolism
A. Two things need –
Energy (E) FOOD
Raw materials
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B. Ways to get food
• 1. Autotroph – Primary producer
a. photosynthesis LIGHT
6CO2 + 12H2O C6H1206 + 6O2 + 6H20
b. cellular respiration
C6H1206 + 6O2 6CO2 + 6H2O 36-38 ATP
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2. Heterotroph
a. Digestion
Polymers Monomers
b. Cellular Respiration
C6H1206 + 6O2 6CO2 + 6H2O 36-38 ATP
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II. General Plant – location of photosynthesis
A. Basic organs and their functions.
STEM
LEAF
ROOT
Photosynthesis (C02 in/O2 out)
support
anchor, store materials, uptake water
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VASCULAR BUNDLE – bundle sheath around
B. Leaf cuticle upper epidermis
palisade
Mesophyll
xylem
spongy
pholem
lower epidermis
stoma guard cell
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C. Chloroplast Structure granum stromaouter memb
Inner memb space
Inner memb thylakoid
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III. Photosynthesis
A. General
EQUATION
LIGHT6 CO2 + 12 H2O
air soil sun
(stomata) (xylem) electromagnetic
spectrum
C6H12O6 + 6 O2 + 6 H2O
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1. Source of the material
a. CO2 - stomata
b. H2O – xylem in roots from soil
c. Light – part of electromagnetic spectrum
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LIGHT
400nm 700nm
V I B G Y O R
What happens to light when it hits?
Transmit
Reflect
Absorb
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Light
Chloroplast
Reflectedlight
Absorbedlight Transmitted
light
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2. Two metabolic pathways
16 ADP + 16Pi
16 ATP
12 NADP + 12H
12 NADPH
12 H2O
24 H+ + 6O2
LIGHT DEPENDENT LIGHT INDEPENDENT
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LIGHT DEPENDENT LIGHT INDEPENDENT
IN:
THYLAKOID STROMA
USES:
WATER, LIGHT CO2, ATP, NADPH
PRODUCES:
HIGH ENERGY COMPOUNDS GLUCOSE
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B. LIGHT DEPENDENT REACTIONS
1. OCCURSPHOTOSYSTEMS = EMBEDDED IN THYLAKOID MEMBRANE
2. CHLOROPHYLLKEY LIGHT CAPTURING MOLECULEABSORBS LIGHT IN WAVELENGTHS OF RED, BLUE, VIOLET
3. ACCESSORY PIGMENTSCAROTENOIDS AND PHYCOCYANINS
4. PHOTOSYSTEMS – TWO DIFFERENT ONES a. Types
PHOTOSYSTEM IPHOTOSYSTEM II
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b. GENERAL ABOUT PHOTOSYSTEMS
b1. THEY ARE EACH A LIGHT HARVESTING COMPLEX
b2. GROUP OF MOLECULES (PROTEINS, CHLOROPHYLL, ACCESSORY
PIGMENTS, e- CARRIER MOLECULES) THAT WORK TOGETHER TO
HARVEST LIGHT INTO HIGH ENERGY COMPOUNDS
b3. STRUCTURE - 2 PARTS• LIGHT HARVESTING COMPLEX = 300 CHLOROPHYLL & ACCESSORY
• e- TRANSPORT CHAIN = SERIES OF e- CARRIER MOLECULES IN MEMBRANE
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Photosystem structure
Photosystem IPhotosystem II
Rxn Ctr P680
Rxn Ctr P700
ATP SYNTHASE
T
H
Y
L
A
K
O
I
D
M
E
M
B
e- TRANSPORT
CHAIN
e- TRANSPORT CHAIN
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Photosystem IPhotosystem II
Rxn Ctr P680
Rxn Ctr P700
ATP SYNTHASE
T
H
Y
L
A
K
O
I
D
M
E
M
B
e- TRANSPORT
CHAIN
e- TRANSPORT CHAIN
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Photosystem IPhotosystem II
Rxn Ctr P680
Rxn Ctr P700
ATP SYNTHASE
T
H
Y
L
A
K
O
I
D
M
E
M
B
e- TRANSPORT
CHAIN
e- TRANSPORT CHAIN
2e-
2e-
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Photosystem IPhotosystem II
Rxn Ctr P680
Rxn Ctr P700
ATP SYNTHASE
T
H
Y
L
A
K
O
I
D
M
E
M
B
2e-
2e-
H+ H+ H+ H+
H+ H+
H+ H+
OUTSIDE THYLAKOID
INSIDE THYLAKOID
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Photosystem IPhotosystem II
ATP SYNTHASE
T
H
Y
L
A
K
O
I
D
M
E
M
B
2e-
2e-
H+ H+ H+ H+
H+ H+
H+ H+
12H2O
24H+ + 6O2
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Photosystem IPhotosystem II
ATP SYNTHASE
T
H
Y
L
A
K
O
I
D
M
E
M
B
2e-
2e-
H+ H+ H+ H+
H+ H+
H+ H+
12H2O
24H+ + 6O2
16 ATP
16 ADP + P
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Photosystem IPhotosystem II
ATP SYNTHASE
T
H
Y
L
A
K
O
I
D
M
E
M
B
2e-
2e-
H+ H+ H+ H+
H+ H+
H+ H+
12H2O
24H+ + 6O2
16 ATP
16 ADP + P
12 NADPH12 NADP + 12 H
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C. LIGHT INDEPENDENT REACTION (CALVIN-BENSON CYCLE)
1. OCCURS
STROMA
2. REQUIRES (USES)
material from
CO2 Air
ATP & NADPH Light Dependent
RIBULOSE BIPHOSPHATE (RuBP) In chloroplast
ENZYMES In membranes
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RIBULOSE BIPHOSPHATE
RuBP
CO2 H2O
PGA
G3P
GLUCOSE
NAMING COMPOUNDS
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1. HAVE 1 FIVE CARBON MOLECULE
5
2. ADD 1 ONE CARBON MOLECULE
1
3. BREAKS INTO TWO THREE CARBON MOLECULES
6
4. REARRANGES INTO TWO DIFFERENT THREE CARBON MOLEC.
6
5. NEED TO REGENERATE STARTING FIVE CARBON MOLECULE SO REMOVE 1 CARBON
1
COUNTING CARBONS - 1 ROTATION
6. NOT YET
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1. HAVE 6 FIVE CARBON MOLECULE
6 X 5 = 30
2. ADD 6 ONE CARBON MOLECULE
6 X 1 = 6
3. BREAKS INTO TWELVE THREE CARBON MOLECULES
12 X 3 = 36
4. REARRANGES INTO TWELVE DIFFERENT THREE CARBON MOLEC.
12 X 3 = 36
5. NEED TO REGENERATE THE SIX STARTING FIVE CARBON MOLEC SO REMOVE SIX CARBONS
36 – 6 = 30
COUNTING CARBONS - 6 ROTATIONS
6. GLUCOSE
ATP
ADP + P
NADPH
NADP + H