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Exam 5 - Coggle Diagram
Exam 5
Photosynthetic Pigments
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Photosynthetic Pigments
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Chlorophy II similar to hemoglobin, likely a common ancestor
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Absorbed Light Energy
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Fate of electron: (passed to electron acceptor, fall back down to original orbital, releasing energy (Heat, fluorescence))
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Resonance Energy
Energy absorption & excitation occurs in organized complexes of pigments & proteins called photosystems
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Phosphorylation
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NADPH
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H2S (Structure similar to H2O, sulfur lower redox potential then oxygen)
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Stomata
Stomata
Small pore bounded by specialized epidermal cells, guard cells
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Intracellular Spaces
Pseudostomata continuous with epidermis or hypodermis, no space
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Stomatal canal, small air space
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Photosynthesis (Origins)
Evidence of Origins
On the tree of life only the organisms at the tips of the limbs require high concentration of oxygen
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~3.5 BYA stromatolites
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Create bonds of sediment & dead bacteria, growing similar to reef
Cyanobacteria
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Chemical clues, 2 methylhopane almost exclusive in cyanobacteria cell walls
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Life on Land
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First Macrofossils
Gametophytes complex
Stomata, conducting elements, & similar to exant liverworts
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Gametophyte Dominant
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Sporophyte
Small, temporary structure
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Gametophyte
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Archegonial head (female), Archegonial (contains eggs)
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Photosystems
Photosystems
Consists of (Antennal Complex, Accessory pigments, chlorophyll pigments, & reaction center)
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Embedded in thylakoid membrane: (PSII, P680, absorbs shorter wavelengths, chl b >> chl a, hydrolysis) (PsI, P700, absorbs longer wavelenths chl a>> chlb)
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Stromal Reactions
RuBisCo
Ribulose 1, bisphosphate 5, carbonxylase oxygenase
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Stromal Reaction
Fixation (CO2 bound to RuBP (C5), immediately breaks into 2 C3s)
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Regeneration (Carbon shuffling, takes more ATP)
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Life Cycle Evolution
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Predictions
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Sporophyte (Short lived, simple)
Gamteophyte (Relatively complex, persistent)
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