1. Chapter 2 The Cell in Action
2-2
Cell Energy

2. Essential Questions Describe photosynthesis and cellular respiration
Compare cellular respiration with fermentation

3. Science Terms Photosynthesis Chlorophyll Cellular respiration
Fermentation
Equation for photosynthesis
Equation for cellular respiration

4. Introduction: Why do people get hungry?
It is their body’s way of telling them they need ENERGY!

5. From Sun to Cell:
Where does nearly all energy for living things come from?
The Sun!

6. From Sun to Cell: What is photosynthesis?
This is the process where plants, algae, and some bacteria make food (sugar)from carbon dioxide (CO2), water (H2O), and sunlight.
What other thing is made by photosynthesis?
Oxygen (O2)

7. Photosynthesis:
What structures within a plant allow it to make food from sunlight, water and carbon dioxide?
Chloroplasts have a pigment called…
Chlorophyll
This pigment gives plants their green color!

8. Photosynthesis: What is the food that plants make called?
Glucose (C6H12O6)
What other thing is made by plants during photosynthesis?
Oxygen (O2)

9. Photosynthesis: What is the equation for photosynthesis?
6CO2 + 6H20 + light energy C6H12O6 + 6O2
Carbon dioxide
Oxygen
Glucose
Water
MAKES

11. Getting Energy from Food:
What are the two ways that animals can get energy from food?
Cellular Respiration
Fermentation
Which one is better at providing more energy for the cell?

12. Cellular Respiration:
What does the word “respiration” mean?
“-tion” means PROCESS
“respire” means BREATHE
Process of Breathing!

13. Cellular Respiration:
Where does cellular respiration happen?
In every living cell
What is cellular respiration?
Cells breathing
Cells combining oxygen with food to release energy (ATP)
What else is made during cellular respiration?
Carbon dioxide (CO2) and water (H2O)

14. Cellular Respiration:
Where (specifically) in a cell does cellular respiration happen?
Prokaryotes (bacteria):
Cell membrane
Eukaryotes (all other animals and fungi)
Mitochondria

15. Cellular Respiration:
What is the equation for cellular respiration?
C6H12O6 + 6O H CO2 + ATP
Glucose
Carbon dioxide
Oxygen
Water
MAKES

16. Cellular Respiration:
What do you notice about cellular respiration when you compare it to photosynthesis?
Each process is the same EXCEPT…
They are backwards from each other.
If you read the equation for photosynthesis backwards, you get cellular respiration.

17. Connection Between Photosynthesis and Cellular Respiration:
How are photosynthesis and cellular respiration related to each other?
Each process provides what the other process needs
Photosynthesis makes the glucose and oxygen needed for cellular respiration
Cellular respiration makes the carbon dioxide and water needed for photosynthesis
It’s a CYCLE!

19. Fermentation: When does fermentation happen?
When there is NO oxygen present

20. Fermentation: When do humans use fermentation?
When they exercise very hard and their muscles need more energy.
Muscles use fermentation to make MORE energy but it also produces a substance called lactic acid
This is the burning sensation you might get when you are tired from working out a lot

21. Fermentation: What other organisms use fermentation? Fungi (yeast!)
Some bacteria