1. 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)

2. Photosynthesis
Process by which a cell captures energy from sunlight and uses it to make food.
Carbon dioxide + water + sunlight = sugar + oxygen 2

3. Photosynthesis
What types of organisms use the energy in sunlight to make their own food?
Plants
Algae
Some Bacteria 3

4. Photosynthesis – Chemical Equation
Write the chemical equation for photosynthesis 4

5. 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? ____ 6 12

6. 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.

7. Cellular Respiration 7

8. Cellular Respiration – Chemical Formula
Write the equation for cellular respiration
C6H12O6  O2 -----> 6CO2  H20 + energy (ATP)
(sugar) (oxygen) (carbon dioxide) (water)
Sugar is broken down into carbon dioxide and water.
Chemical energy (ATP) is released 8

9. C6H12O6  + 6O2 -----> 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)? ___ 12 6

10. 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. 10

11. 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. 11

12. Lets compare…. Photosynthesis: 6CO2 + 6H2O --------> C6H12O6 + 6O2
sunlight
Cellular Respiration:
C6H12O6  O2 -----> 6CO2  H20 + energy (ATP) 12