Lecture 10 – Photosynthesis
Lecture 10 ? Photosynthesis
Winter 2012 BIOL211
In this lecture...
? Respiration vs. photosynthesis ? Electromagnetic spectrum ? Structure of chloroplasts ? Chlorophyll ? The light cycle
? Linear flow ? Cyclic flow
? The Calvin Cycle
Winter 2012 BIOL211
Recycling Carbon
? Atomic carbon is recycled from plants to animals and back again
? This happens because cellular respiration and photosynthesis are opposite reactions
C6H12O6 + 6O2
6CO2 + 6H2O + energy
6CO2 + 12H2O + energy
C6H12O6 + 6H2O+ 6O2
Winter 2012 BIOL211
Sunlight is the source of energy on Earth
Photosynthesis occurs in plants, algae, certain other protists, and
some prokaryotes These organisms feed not only themselves but also most of the
living world
Winter 2012 BIOL211
Why do photosynthesis?
? Photosynthesis creates glucose from carbon dioxide, water and light
? Plants need glucose to store energy and to build cellulose
? However, photosynthesis does not produce enough ATP for the cell's purposes
? Plant cells also have mitochondria to produce ATP
Winter 2012 BIOL211
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