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Energy Metabolism: Photosynthesis (Photosynthesis (Photosystem II…
Energy Metabolism: Photosynthesis
Photosynthesis
Uses light energy
To synthesize
Light-Dependent
Thylakoid reactions
Water & light
Create ATP & NADPH
Photosystem I
Have little chlorophyll b
P700
Photosystem II
Chlorophyll levels
Almost = to chlorophyll a
P680
Stroma Reactions
Calvin/Benson Cycle
C3 Cycle
Take place in stroma
Anabolic Metabolism
Anabolism
Consists of anabolic reactions
Gluconeogenesis
Anabolic synthesis of glucose
Energy & Reducing Power
Energy Carriers
Energy enters
Through Photosynthesis
Reducing Power
Oxidized:
Atom does not
Carry enough electrons
Electrons added to atom =
Reduced
Reduction reaction
Reduces positive charge
Oxidation reaction
Increases positive charge
Other electron carriers
Cytochromes
Small proteins
Contains:
Cofactor
Heme
Plastoquinones
Transport electrons
Short distance
Within the membrane
Plastocyanin
Small protein
Carries electrons
On a metal atom
Concepts
Photoautotrophs
Gather energy
From light
Heterotrophs
Take in organic molecules
obtain the energy
Environmental & Internal Factors
Light
Quality
Colors/wavelengths
Quantity
Light intensity/brightness
Leaf Structure
palisade parenchyma
Above
spongy mesophyll
Below
Water
Greatly affects Photosynthesis
C4 Metabolism
Amount of water lost
For each molecule of carbon dioxide absorbed
Photorespiration
Energy-wasting process
Crassulacean Acid Metabolism
Second metabolic adaptation
Improves conservation of water
While permitting photosynthesis
