1. Enzymes

2. Enzymes proteins that catalyze (speed up) reactions in living things.
Work by lowering the activation energy of a chemical reaction

3. Activation energy
The energy needed to start a chemical reaction

4. Activation Energy is lowered by enzymes.

5. Activation energy

6. How enzymes work Enzymes fit into the substrate like a lock and key
Enzymes can break down or put together substrates

7. Examples of enzymes

8. Characteristics of Enzymes
Can be used outside the body
Are specific like a lock and key (only one job)
remain unchanged after a reaction
Can be used over and over again
Are effected by pH
Are effected by temperature

9. Optimum Temperature and Fever
Fever is the elevation of body temperature above normal (In humans 98.6o F). Typically, fevers develop in response to bacterial or viral infection.
The optimal temperature for most bacterial enzymes is less than 98o F, so by raising body temperature above that, the immune system attempts to denature the bacteria's enzymes and stop the infection.

10. Common Enzymes
Laundry detergents contain enzymes that help break up and remove stains from your clothing.
Why might you want to use a different laundry detergent when you wash clothes in hot water instead of in cold water?