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BI110 (469)
Lecture 20

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Department
Biology
Course
BI110
Professor
Matthew Smith
Semester
Fall

Description
 Energy Flow o  Energy Levels of Electrons of an Atom o An electron further from nucleus contains more energy o Do molecules that contain lots of electronegative atoms have more or less potential energy?   Food as Fuel o Two good fuels: gasoline and glucose o  Redox Reactions o Reduction-oxidation reactions  Transfer electrons from donor to acceptor atoms  Electrons lose energy as they pass from donor to acceptor molecule  Usually protons accompany the electrons (reduction of NAD )  Donor becomes oxidized as it releases electrons  Acceptor becomes reduced  (LEO the lion says GER)  Redox Reactions Can Involve a Change in the Degree of Electron "Sharing" o  Cellular Respiration o Organisms obtain energy by oxidizing organic molecules produced by photosynthesis in a series of
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