01:119:115 Lecture Notes - Lecture 9: Purple Sulfur Bacteria, Electromagnetic Spectrum, Accessory Pigment
18 Oct 2016
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Document Summary
Purple sulfur bacteria (prokaryotes: photoautotrophs: use e of sun to make organic molecules from co2, heterotrophs: obtain organic material from other organisms. Living organisms made of carbon-based molecules: source of c is co2. Each has a wavelength (distance from one peak to the next) Electromagnetic spectrum: range of electromagnetic energy, or radiation. Most biological processes use ?: effects of photo absorption on the electrons of a molecule. When a molecule absorbs a photon of light energy. An electron becomes energized it shifts from a lower e orbital to a higher e orbital. Longer = less energy per photon: e dissipates as heat, emission of light of longer wavelength, form of fluorescence. Return to lower r orbital (ground state) and either: leave atom and be captured by an acceptor. Stroma: fluid filled space containing enzymes (to produce ch2o"s) where 2nd step of: chloroplasts: site of photosynthesis in eukaryotes, photosynthetic pigments. Mesophyll cells: in interior tissue of the leaf.
