Transcript Ch 9 Cellular Respiration and Fermentation

1 Review Why do all organisms need food
Relate Cause and Effect Why do macromolecules
differ in the amount of energy they contain
2 Apply Concepts How does the process of cellular
respiration maintain homeostasis at the cellular level
Use Analogies How is the chemical energy in glucose
similar to money in a savings account
CH 9 CELLULAR RESPIRATION AND
FERMENTATION
9.1 Cellular Respiration: An Overview
Chemical Energy and Food
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Why do you need food
 It
provides the chemical building blocks they need to
grow and reproduce
 It contains chemical energy that is released when its
chemical bonds are broken.
Calorie
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Amount of energy needed to raise the
temperature of 1 gram of water by 1 degree
Celsius
1000 calories = 1 kilocalorie, or Calorie.
Cellular Respiration
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Series of chemical reactions that breaks down
sugar and releases energy
Occurs in all living cells
Opposite of photosynthesis
Oxygen + Glucose  Carbon dioxide + Water +
Energy
6 O2 + C6H12O6  6 CO2 + 6 H2O + Energy.
Cellular Respiration
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This occurs in animals AND plants
This is the process that whenever your body needs
energy
In addition to sugar, fats and proteins may also be
used.
SIMILAR
 Burn fuel
 Produce heat
 Produce H2O
 Produce CO2
 Produce energy
DIFFERENT
 Cellular Respiration release
energy a little at a time
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Controlled
Stages of Cellular Respiration
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Glycolysis
Krebs cycle
Electron Transport
Chain (ETC).
Glycolysis
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Produces only a small
amount of energy
Most energy (90%)
remains in the
chemical bonds.
Krebs Cycle
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Produces only a small
amount of energy.
Electron Transport Chain (ETC)
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Produces the bulk of
the energy
Uses oxygen.
Aerobic
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Require oxygen
Krebb Cycle and ETC
Occurs in the
mitochondria.
Anaerobic
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Does not need oxygen
Glycolysis
Occurs in cytoplasm.
Photosynthesis and Cellular Respiration
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Opposite processes
Photosynthesis
“deposits” energy
Cellular respiration
“withdraws” energy.