1. Enzymes help to start and run chemical reactions

2.  What is a catalyst?
A catalyst is a substance that decreases the activation energy needed to start a chemical reaction and increase the rate of chemical reactions.

3.  Catalysts Activation energy comes from an increase in temperature
Without a catalyst a chemical reaction can take a while to start.
Catalysts are not considered reactants or products because they are not used up during a reaction.

4.  Define enzymes Proteins that change the rate of a chemical reaction.
In other words…helps speed up the
chemical reactions that would occur
very slow normally.

5.  What major process in the body are enzymes important for?
Food Digestion

6.  Enzymes Act as catalyst (boosters) How do enzymes speed up chemical
reactions?
→ By lowering the activation level
Activation level is the amount of energy needed to kick start a chemical reaction.

7. Factors that Affect Enzyme Reaction Rates.
Normal Enzyme Reaction Rate
Bell Shape Curve
Enzyme
Reaction
Rate
Amt. of Enzyme
Colder Temps =
Slows Down
Reaction Rate
Warmer Temps =
Speed Up
Reaction Rate
Reaction Rate
Reaction Rate
Amt. of Enzyme
Amt. of Enzyme

8.  Factors that Affect Enzyme Reaction Rates.pH
If an enzyme’s environment is TOO ACIDIC or TOO BASIC…
If an enzyme’s environment is EXTREMELY COLD or EXTREMELY HOT… X
Denature =
When enzymes
break down and die.

9. How Do Enzymes Change the Rate of a Reaction?
Step #1
Enzymes bind to
specific
substrates at the
active site.
Substrate is the
compound
being broken down
into smaller
molecules.

10. Enzyme Reaction Rate Step #2 Enzymes change shape in order to
bind with the
substrate.

11. Enzyme Reaction Rate Step #3 Substrate bond is broken.
Smaller molecules
are released.

12. Enzyme Reaction Rate Step #4 Enzyme returns back to original shape.
Cycle repeats.

13. Enzyme Reaction Rate
Lock and Key Method