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Chapter 11 Energy Metabolism: Photosynthesis, Reductions and Oxidations,…
Chapter 11 Energy Metabolism: Photosynthesis
Concepts
Entropy
Photoautotrophs
Heterotrophs
Energy & Reducing Power
Energy Carriers
Photo-phosphorylation
Substrate-level phosplorylation
Oxidative phosphorylation
Guanosine triphosphate
Oxidation States
Oxidation reaction
Oxidized Compounds
Oxidized
Reduction States
reduction reaction
Reduced Compounds
Reduced
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Reducing power
Oxidizing agents
Reducing agents
Redox potential
Other Electron Carriers
Cytochromes
Plastoquinones
Plastocyanin
Photosynthesis
Light-dependent Reactions
The Nature of Light
Quanta
Photons
Electromagnetic radiation spectrum
Nature of Pigments
Pigments
Chlorophyll a
Fluorescence: the release of light by a pigment
Any material that absorbs wavelengths
Electrons
Ground state
Excited state
Activated
Photochemical process
Action spectrum
Absorption spectrum
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Accessory pigments: molecules that strongly absorb wavelengths not absorbed by chlorophyll a.
Resonance
Allows chlorophyll b to absorb wavelengths that chlorophyll a would miss and then transfer to chlorophyll a for use in chemical reactions.
Photosynthetic unit:
pigments and carriers in granular arrays
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Reaction center: structure that contains a pair of special molecules of chlorophyll a, whose properties differ from those of all of other molecules of chlorophyll a in the complex.
Antenna complex
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Photosystem I: photosynthetic units with little chlorophyll b
P700: reaction center
ferredoxin: reduced Fox immediately passes through this protein in the thylakoid membrane
Ferredoxin-NADP+-reductiase: deuces NADP+ Converting to NADPH
Photosystem II: Photosynthetic units with plenty of chlorophyll b is present at levels almost equal to chlorophyll a
Cytochrome b6/f complex: gets electrons from a molecule of plastoquinone
Q: a molecule of quinone, a carrier.
Phaeophytin: a chlorophyll a molecule that does not have magnesium atoms
P680: reaction center of Photosystem II
Electron transport chain: electrons are moved from P680 to P700
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The Synthesis of ATP
Chemiosmotic phospohorolation : generates necessary ATP in mitiochrondria
Grana (sing. Granum): thylakoids in one region form vesicles at the same spot, forming in sets
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Frets: thylakoids that’s lie between grana
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Stroma: liquid surrounding the thylakoid system
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Thylakoid lumen: thylakoid compartment, enzymes and electon carriers are embedded in the membrane layer facing the lumen.
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ATP synthase
Channels of complex sets of enzymes that can synthesize ATP from ADP and Posphate
CF0-CF1 Complex
ATP synthase of chloroplasts specifically
Noncyclic electron transport: when electrons flow smoothly from water to NADPH
Cyclic Transport Chain: the plastoquinones carry the electons along just as thought they had gotten them from Q & use their energy ot pump more protons into the thylakoid lumen.
With it, chloroplasts make extra ATP w/o making extra NADPH
Stroma reactions
Calvin-Benson Cycle (or the C3 Cycle)
Acceptor molecule (ribulose-1, 5-biphosphate [RuBP]): reacts with molecule of carbon dioxide
3-phosphoglycerate (C3): orbitals are rearranged and two identical molecules are formed that contain 3 carbons each
RuBP carboxylase (RUBISCO): enzyme that carries out this reaction. One of the largest & most complex enzymes- 2 protein subunits.
1,3-diphosphohlycerate: when an ATP donated a high-energy phosphate group to the 3-phosphoglycerate
3-phosphoglyceraldehyde (PGAL) : a phosphate comes off in the next step too.
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Anabolic Metabolism
Ababolism: constructive metabolism
Anabolic reactions
The Synthesis of Polysaccharides
Gluconeogenesis: anabolic synthesis of glucose
Dihydroxyacetone phosphate
Fructose-1, 6-biphosphate
Fructose-6-phosphate
Glucose-6-phosphate
Environmental & Internal Factors
Light
Quality of sunlight
Quality of light
Light compensation Point
Leaf Structure
Water
C4 Metabolism/ C4 photosynthesis
Water use efficiency
Photorespiration
Phosphoenolpyruvate (PEP) carboxylase
Crassulacean Acid Metabolism
(CAM)
Plants & People
photosynthesis , global warming, & global climate change
Greenhouse effect
Greenhouse gas
Global warming
Global climate change
Ozone
Photosynthesis in Bacteria and Cyanobacteria
Oxygenic photocynthesis
Bacteriochloropylls
Anoxygenic photosynthesis
Reductions and Oxidations
Chlorophyll a absorbs red and blue light on absorption spectrum
protiens that hold pigment in place
Photosynthetic unit is used before chlorophyll can be used. Used before fluorescence can occur
Pigments and carriers are packed into photosynthetic units
electrons are moved from P680 to P700
electrons are moved from P680 to P700
Is then reduceded by NADPH