Prokaryotes and the Origin of Life

Prokaryotes and the Origin of Life - Photosynthesis esis...

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Photosynthesis 19:45 Photosynth esis - Conversion of light energy to chemical bond energy I. Light - A. Form of electromagnetic energy 1. Electromagnetic spectrum 2. Waves (of radiation) 3. Wavelength (lambda) o a. Gamma rays  short wavelength, high energy o b. x-ray o c. ultraviolet o d. visible violet (380 nm) – most E red (760 nm) – least E o e. Infrared o f. Microwaves o g. Radiowaves long wavelength, low energy - B. Photon 1. Small particle of light 2. Amount of E in photon is inversely proportional to its wavelength - C. Biological processes that use light, use visible light
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Enough E to be useful but not so much E to be destructive - D. Molecule absorbs a photon of light E 1. Electron becomes energized o shifts from lower E orbital to higher  2. E- may either o A. return to lower E orbital = ground state and either E dissipate as heat Emission of light of longer wavelength than absorbed light =  fluorescence o Which is reduced II. Chloroplasts - conversion of light E to chem. bond E in form of simple sugar eukaryotes  - A. Structure – 3 Membranes SEE NOTEBOOK!!! - B. Photosynthetic pigments 1. Pigment o Substance that absorbs visible light 2. Photosynthetic pigments o a. in thylakoid membrane o b. capture light energy 3. Chlorophyll - main pigment
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o a. long hydrocarbon tail hydrophobic holds molecule in place (in thy. Membrane) o b. porphyrin ring absorbs light energy Magnesium atom center o c. 2 main forms Chlorophyll a Primary Chlorophyll b 4. Accessory pigments o chlorophyll ex: chlorophyll b, carotenoids (yellow, orange) 5. Absorption o a. each pigment absorbs light E better at some wavelengths than others o b. absorption spectrum of a pigment plot of absorption of light of different  λ o c. action spectrum which   are most efficient for photosynthesis λ III. Photosynthesis - 2 Parts 1. Light– d e p e n d e nt reactions = photo
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2. Carbon fixation reactions = synthesis - A. Light-dependent reactions 2. 12H2O + 12NADP+ + 18ADP + 18Pi + Light o >>> 6O2 + 12NADPH + 18ATP 3. 2 types of light-dependent reactions o o in thylakoid membrane o capture light E and transfer excited e- o 5. Antenna complex o light gathering units o chlorophyll, accessory pigments, and proteins 6. Reaction center
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This note was uploaded on 11/15/2010 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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Prokaryotes and the Origin of Life - Photosynthesis esis...

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