Reading BIO NOTES - :CapturingEnergy molecules 6CO...

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Chapter 9-Photosynthesis: Capturing Energy Photosynthesis -light energy is converted into the stored chemical energy of organic  molecules  o 6CO_ + 6H_O                   C_H_O_ + 6O_ Photons -small particles or packets of energy (light is composed of photons) o When a molecule absorbs a photon of light energy, one of its electrons becomes  energized, electron shifts from a lower-energy atomic orbital to a higher one Visible Spectrum : 380-760nm, includes all the colors of the rainbow (humans can see  it) o wavelength Ground State:  condition in which all of the atoms electrons are in their normal, lowest- energy levels o When an electron returns to ground state, its NRG dissipates as heat or as an  emission of light (fluorescence) of a longer wavelength than the absorbed light  Chloroplasts  lie mainly inside the leaf in the cells of the  mesophyll  (a layer of w/many  exchanges gases w/the outside through microscopic pores, called  stomata . Stroma:  inner membrane of the chloroplast (fluid-filled region) which contains most of  the enzymes required to produce carbohydrate molecules  Thylakoids:  (3 rd  system of membranes) an interconnected set of flat, disclike sacs o Thylakoid membrane encloses a fluid-filled interior space, the  thylakoid lumen o Thylakoid sacs are arranged in stacks called  grana  (looks like a stack on coins) Chlorophyll: regions of the visible spectrum  (green light is not appreciably absorbed by chlorophyll) o Chlorophyll A- initiates the light-dependent reactions of photosynthesis
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o Chlorophyll B -an accessory pigment that also participates in photosynthesis.  Differs from chlorophyll A only in a function group on the porphyrin ring  Chlorophyll-binding proteins facilitate the transfer of energy from one molecule to  another Chloroplasts have other accessory photosynthetic pigments  (carotenoids)  which are  Carotenoids  absorb diff. wavelengths of light than chlorophyll Light dependent reactions:  light energy is converted to chemical energy o Begins as chlorophyll captures light energy. The energized electron is transferred  molecular oxygen is released.  o  are the products of the  light-dependent reactions Both are needed in the energy-requiring carbon fixation reactions
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This note was uploaded on 03/09/2011 for the course BIO 101 taught by Professor Martin during the Spring '08 term at Rutgers.

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Reading BIO NOTES - :CapturingEnergy molecules 6CO...

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