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1 Review Why do all organisms need food Relate Cause and Effect Why do macromolecules
differ in the amount of energy they contain2 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
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
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
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
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.
Burn fuel Produce heat Produce H2O Produce CO2
Produce energy
SIMILAR DIFFERENT Cellular Respiration release
energy a little at a time Controlled
Stages of Cellular Respiration Glycolysis Krebs cycle Electron Transport
Chain (ETC).
Glycolysis Produces only a small
amount of energy Most energy (90%)
remains in the chemical bonds.
Krebs Cycle Produces only a small
amount of energy.
Electron Transport Chain (ETC) Produces the bulk of
the energy Uses oxygen.
Aerobic Require oxygen Krebb Cycle and ETC Occurs in the
mitochondria.
Anaerobic Does not need oxygen Glycolysis Occurs in cytoplasm.
Photosynthesis and Cellular Respiration
Opposite processes Photosynthesis
“deposits” energy Cellular respiration
“withdraws” energy.