Biol 101 24 January 2008

Biol 101 24 January 2008 - Biol 101 24 January 2008...

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Biol 101 24 January 2008 Photosynthesis and Cell Respiration (Only names of molecules mentioned in class) Photosynthesis o Not a cycle of energy, a cycle of molecules (mostly carbon) In the chloroplasts, CO2 and H2O enter the chloroplasts; C becomes part of glucose (higher energy molecule than CO2): glucose stores some of the energy that came from sunlight; O comes from H2O; C and O from CO2, H from H2O in glucose Glucose used by cells and some of the energy participates in reactions in the mitochondria; in mitochondria, energy is transferred from glucose to ATP; H, C, and O go back to CO2 and H2O With every transfer of energy, some will be lost in heat o How do plants grow? Ancients thought plants ate soil Van Helmont in 1600’s: no loss in soil weight By 1700’s: plants needed something from atmosphere Most of the mass of the plant comes from CO2 o Plants need what? CO2
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Biol 101 24 January 2008 - Biol 101 24 January 2008...

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