BIOL10004 Lecture Notes - Lecture 8: Photo-Oxidation Of Polymers, Porphyrin, Carotenoid
14 Jun 2018
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BIOL – Lecture 8
Photosynthesis
Harvesting light energy
• earliest organisms were heterotrophs
o oxidised molecules
o non-renewable
• photosynthesis evolved 3bya and radically changed the planet
o decreased atmospheric CO2 and filled it with O2
Chloroplast
Main photosynthetic pigments
• chlorophyll – central
magnesium atom
surrounded porphyrin ring
o chlorophyll a and b
• carotenoids
o absorb in blue-green
spectrum (appear
yellow-red)
o extend light
harvesting range
o protect against
photo-oxidation
o some herbicides
work by blocking
carotenoid synthesis
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