1. Enzymes
Special Proteins

2. How can I tell if the protein is an enzyme?
Catalyst
A substance that speeds up a chemical reaction without being changed.
A biological PROTEIN that speeds up metabolism (chemical reactions in the body)
All enzymes end in –ase
Ex. Lactase (breaks down milk)
Helicase (breaks down DNA)
Enzyme
How can I tell if the protein is an enzyme?

3. Lock and Key Model Enzyme Substrate Product
Each enzyme only breaks one specific substrate (it has to fit)
What is breaking bonds
What is being broken
What is being produced
Enzyme
Substrate
Product

4. Work with your partner to determine what this chart is trying to explain.

5. How does it work? Activation Energy Breaking Bonds requires energy
The energy needed to start a reaction (break bonds)
Enzymes hold the substrate in place
Not as much energy needed to break bonds (lowers activation energy)
Activation Energy

6. What can stop an enzyme?
An inhibitor

7. What can stop an enzyme? Cont.
Remember and enzyme is a protein
Denatures (rips apart) proteins with heat or cold
Denatures proteins by burning with acids or bases
What can stop an enzyme? Cont.
Changes in Temperature (anything besides 98.6)
Changes in pH (anything besides neutral)