Chapter 2

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Chapter 2 Cell Processes and Energy

• Cell Processes Include
• Photosynthesis
• Respiration
• Cell Division mitosis (all cells except sex
  cells)
• Cell Division meiosis (to produce sex cells)

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Photosynthesis

• Process by which a cell captures energy from
  sunlight and uses it to make food.

Carbon dioxide water sunlight sugar
oxygen
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Photosynthesis

• What types of organisms use the energy in
  sunlight to make their own food?
• Plants
• Algae
• Some Bacteria

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Photosynthesis Chemical Equation

1. Write the chemical equation for photosynthesis

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• In this equation, one of the raw materials of
  photosynthesis is 6 molecules of carbon dioxide
  (CO2).
• How many carbon atoms are in 6 molecules of CO2?
  ____
• How many oxygen atoms are in 6 molecules of CO2?
  ____

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Cellular Respiration Chapter 2, Section 2

• What is cellular respiration as it relates to
  cells?
• During cellular respiration cells break down
  sugar molecules and release the energy stored in
  the bonds.
• Occurs mostly in the mitochondria.

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Cellular Respiration
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Cellular Respiration Chemical Formula

• Write the equation for cellular respiration

C6H12O6  6O2 -----gt 6CO2  6H20 energy
(ATP) (sugar) (oxygen) (carbon
dioxide) (water)
Sugar is broken down into carbon dioxide and
water. Chemical energy (ATP) is released
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C6H12O6  6O2 -----gt 6CO2  6H20 energy
(ATP) (sugar) (oxygen) (carbon
dioxide) (water)

• In this equation, one of the products of
  respiration is 6 molecules of water (H2O).
• How many hydrogen atoms are in 6 molecules of
  (H2O)? ___
• How many oxygen atoms are in 6 molecules
  of(H2O)? ___

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6
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Cellular Respiration 2 stages

• Where does the first stage of cellular
  respiration take place?
• In the cytoplasm
• What happens during this stage?
• The glucose molecule is broken in half.
• A small amount of energy is released.

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Cellular Respiration 2 stages

• Where does the second stage of cellular
  respiration take place?
• In the mitochondria
• What happens during this stage?
• The two halves of the glucose molecule are broken
  down into smaller molecules.
• A great deal of energy is released.

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Lets compare.
Photosynthesis 6CO2 6H2O --------gt
C6H12O6  6O2 
sunlight
Cellular Respiration C6H12O6  6O2 -----gt
6CO2  6H20 energy (ATP)