1. Energy in Cells

2. Metabolism
The total of all chemical activities of an organisms that enables it to stay alive, grow and reproduce.
Chemical energy – stored in food in the cell
- can be changed into other forms of energy
Heat, kinetic energy

3. enzymes Causes a chemical reaction Does not change Can be reused
Each chemical reaction has a specific enzyme
Causes molecules to come apart
or come together

4. How enzymes work

5. 2 groups of organisms Producers – make their own food
Consumers – eat producers and/or other lower consumers
Energy is changed chemically from one to the other.

7. Photosynthesis Changing sunlight into chemical energy
Chloroplasts – where photosynthesis takes place

8. Photosynthesis 6CO2 + 6H2O + sunlight + chlorophyll  (C6H12O6) +6O2

9. Chlorophyll absorbs energy from sun
Sun’s energy splits H2O and CO2 into C6H12O6 + O2
O2 given off through leaves
Glucose – chemical/ stored energy

10. Glucose 1. use for plant energy 2. stored as starches (carbohydrates)
to be used later

11. Respiration Breaking down of food to release energy
Mitochondria – where respiration takes place
Sugar + O2  CO2 + H2O + energy
(lost as heat)
kinetic /moving
electrical energy

12. Fermentation Changing glucose into energy with little oxygen
Less energy produced
Takes place in the cytoplasm
Makes lactic acid that gets into the muscle fibers and causes cramps.