bio2ch8 - Chapter 8 Photosynthesis: Energy From the Sun 1)...

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Chapter 8 Photosynthesis: Energy From the Sun 1) Photosynthetic Reactants and Products a) Uses water, CO2, and light b) Produces carbohydrates and O2 gas c) Water comes from the soil d) O2 and water are released through stomata e) Light is absolutely necessary 2) Where does the O2 come from? a) 6 CO2 + 12 H2O => C6H12O6 + 6O2 + H2O b) Used an isotopic tracer to figure this out i) Two plant groups ii) Plants given labeled H2O released labeled O2 3) Photosynthesis takes place in the leaves 4) Photosynthesis: An Overview a) Capturing energy from sun b) Using light energy to form ATP and NADPH c) Using ATP and NADPH to make organic (carbohydrate) molecules 5) Light and Pigments a) Light is a form of electromagnetic radiation i) Comes in packets called photons ii) Light is also a wave iii) Amount of energy in a photon of light is inversely proportional to its wavelength b) Two requirements for photons in biological processes i) Must be absorbed ii) Must have energy to do chemical work c) 3 possibilities when a photon hits a molecule i) It is scattered (reflected) ii) It is transmitted iii) It is absorbed d) When the photon is absorbed the pigment becomes excited i) Molecule is more chemically active e) Pigments i) Molecules that absorb wavelengths in the visible spectrum 6) Absorption Spectrum
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This note was uploaded on 04/07/2008 for the course BIOL 2180 taught by Professor Harmich during the Spring '08 term at Toledo.

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bio2ch8 - Chapter 8 Photosynthesis: Energy From the Sun 1)...

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