Lab #7 – Bio 101 Photosynthesis. Reminder: Photosynthesis is the opposite of respiration...
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Transcript of Lab #7 – Bio 101 Photosynthesis. Reminder: Photosynthesis is the opposite of respiration...
Lab #7 – Bio 101Photosynthesis
Reminder: Photosynthesis is the opposite of respiration
Endergonic – absorbing energyTransforms radiant energy to chemical energy
Exergonic – releasing energyTransfers one type of chemical energy to another (ATP)
Ecological ImplicationsPhotosynthesis converts 100 billion metric tons of atmospheric carbon into biomass every year; captures 6x more energy than humans use!
How does photosynthesis work?
Light and dark reactions – inputs and outputs
Evolution of photosynthesis - endosymbiosis Evolved at least 2.5 billion years ago!Mitochondria aerobic proteobacteriumChloroplasts Cyanobacteria
Evolution of photosynthesis - endosymbiosis Evolved at least 2.5 billion years ago!Mitochondria aerobic proteobacteriumChloroplasts Cyanobacteria
Note the similarities:
Photosynthesis in other organisms
Oriental hornet – evolved adaptation to harvest solar energy using yellow xanthopterin pigment… very similar to plants!
Bacteria – Different inputs/outputs, but similar processes.
Pigments make it all possible
Pigments make it all possible
Pigments absorb the sun’s radiant energy
Pigments serve a range of functions:
Chlorophylls – maximum photosynthesisCarotenoids – Extendeds range of wavelengths, protects chlorophylls Anthocyanins – attractor for pollinators, sunscreen, protection from herbivory/cold (?)