LEC 11 Photosynthesis - PHOTOSYNTHESIS PHOTOSYNTHESIS A...

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PHOTOSYNTHESIS
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PHOTOSYNTHESIS A direct source of free energy and reduced C in: ! all higher plants ! many primitive plants and protists (all algae, large and small) ! some marine animals that take up algae into their cells ! some prokaryotes (cyanobacteria, green and purple bacteria) An indirect source of free energy and reduced C in: ! animals ! fungi ! non-photosynthetic protists and bacteria ! anything that eats or parasitizes photosynthetic organisms
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Focus on the light reactions
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Light capture: conversion of light energy to chemical energy The main pigment of photosynthesis is chlorophyll ! Planar ring ! Conjugated double bonds ! Mg in center ! Phytol tail
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Light ! Different colors ! Different wavelengths ! Different energies per quantum (photon) E/photon (kcal/mol) 72 52 41
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Atoms/molecules ! Different structures ! Different electron orbitals ! Different energies per orbital jump
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Atoms/molecules ! Different structures ! Different electron orbitals ! Different energies per orbital jump The structure of chlorophyll specifically allows absorption of blue and red photons
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(Why is the action
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This note was uploaded on 07/08/2010 for the course BIS B16 taught by Professor Gerhart during the Winter '10 term at The University of British Columbia.

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LEC 11 Photosynthesis - PHOTOSYNTHESIS PHOTOSYNTHESIS A...

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