01:119:115 Lecture Notes - Lecture 9: Light-Harvesting Complex, Photosynthetic Pigment, Intermembrane Space

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A: life made of carbon-based molecules, source of c is atmospheric co2, co2. C-based macromolecules = carbon fixation: animal cells cannot fix carbon, photosynthetic organisms can fix co2, use e from sun. Photoautotrophs: use sunlight to make organic molecules from co2, = producers. Light: light is a form of electromagnetic e, all radiation travels as waves, wavelength (lambda): distance from peak to peak, most biological process use visible light. Photons: particle of light e, photon e inversely proportional to wavelength. Photons are e that can be absorbed by e- Energize e- shift from lower e orbital to higher e orbital. Sunlight hits photons, gets excited, becomes to energized e: energized electrons. Return to lower e orbital (ground state) (e. 1. a. 1) emit heat (e. 1. a. 2) emit light (fluorescence) (e. 1. a. 3) e is not harnessed. Leave atom, captured by acceptor (e. 1. b. 1) occurs in photosynthesis (e. 1. b. 2) redox reaction. Chloroplasts: photosynthetic organelle in eukaryotic cells, derived from cyanobacteria.

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