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Chapter 9

BIOL 102 Chapter 9: Cellular Respiration and Fermentation


Department
Biology
Course Code
BIOL 102
Professor
Dr. W.A. Snedden
Chapter
9

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Chapter Nine
Catabolic Pathways
- Fermentation- partial degradation of organic fuel without the use of oxygen
- Aerobic respiration- oxygen is consumed as a reactant along with the organic fuel
- Cellular respiration- both aerobic and anaerobic processes
- Electron transport chain- number of molecules built into the inner membrane of
mitochondria
o Electrons from glucose are shuttled by NADH to the higher energy end of the
chain
o 𝑂2 captures these electrons at the lower energy end to form water
- Substrate-level phosphorylation- enzyme transfers a phosphate group from the
substrate to ADP to make ATP
Redox Reactions
- Transfer of electrons from one reactant to another
- During cellular respiration, the fuel (such as glucose) is oxidized, and O2 is reduced
- OIL RIG (oxidation is losing, reduction is gaining)
Four stages of aerobic respiration:
1.) Glycolysis
2.) Pyruvate
oxidation
3.) Citric acid cycle
4.) Oxidative
phosphorylation:
electron
transport and
chemiosmosis
Glycolysis
- Can occur with or without O2
- Occurs in the cytosol
- Gets some of the energy out of reduced carbon (typically sugars)
- Energy is captured in the form of energy rich molecules (ATP, NADH)
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