1. Cell Energy

2. ATP (adenosine triphosphate)
A molecule of energy which is created by the mitochondria when the cell undergoes cellular respiration

3. Questions What does a molecule of ATP release?
How does a molecule of ADP gain energy?

4. Photosynthesis
The process by which plant cells use light energy to make sugar energy in plants
1. Plant leaves capture energy from sunlight.
2. Leaves take carbon dioxide from the air.
3. Leaves use water and the sun's energy to convert carbon dioxide into sugar
4. Leaves release oxygen into the air.

5. Chlorophyll
Chlorophyll in the chloroplast traps light energy needed for photosynthesis

6. Question
Why are plants and other autotrophs necessary for the life of most organisms on earth?

7. Cellular Respiration Takes place in all living cells
The process by which mitochondria breaks down food molecules to produce ATP
Uses stored energy in sugars to make ATP for cells
May take place WITH or WITHOUT oxygen
Oxygen (O2) + Carbohydrate (CH2O)  Carbon Dioxide (CO2) + Water (H2O) + ATP

8. Formula for cellular respiration
Oxygen + Sugar -> Carbon Dioxide + Water + ATP
O2 + C6H12O6 yields CO2 + H2O+ (ATP)

9. Questions
What kinds of living things need to undergo the process of cellular respiration?
How does an animal get sugar (glucose)?

10. Anaerobic vs Aerobic Anaerobic: no oxygen is required
Produces a small amount of energy
Examples:
Alcohol
Lactic acid fermentation
Aerobic:
requires oxygen
Produces much, much more energy
Examples:
Cellular respiration

11. Questions
Which process, aerobic or anaerobic respiration, can obtain the greatest amount of energy (ATP) from a glucose molecule?
Why might you experience muscle fatigue after exercising?