1. Aim: Why are Enzymes necessary for our survival?
A + B C C
A + B

2. What role do enzymes play in our bodies?
Enzymes speed up
chemical reactions
A + B C

3. Let’s Review Chemical Reactions:
A + B C or
C A + B
Reactants
Products

4. A + B AB + H2O What Reaction is this? Enzyme Dehydration Synthesis
If an enzyme is added to the reaction, then it will
speed up the reaction.
In other words, we will produce AB more quickly.

5. What is a Catalyst? Why are enzymes called organic catalysts?
A catalyst is any substance that speeds up a
chemical reaction without itself being changed.
Why are enzymes called organic catalysts?
They are PROTEINS!!
Proteins contain carbon and hydrogen!

6. What are some important reactions that enzymes need to speed up?
Digestion
Synthesis
Photosynthesis
Cell Respiration

7. A + B AB How do enzymes work?
Enzymes bind to the substance (substrate)
so the chemical reaction can take place.
ENZYME
A + B AB

8. What are Substrates and Active Sites?
A + B AB AB
Substrates-are the substances that bind to the enzyme
Active Site- is the place on the enzyme where the
substrates comes in contact with it. (touches)

9. Think of enzymes and substrates as a lock and key
Enzymes are specific!
Enzyme
Active Site

10. Enzyme-Substrate Complex
It is formed when the substrate is bound to the enzyme.

11. Enzyme-substrate specificity:
Enzymes are SPECIFIC (in shape) for the SUBSTRATES they attach to, just like a lock and key.

12. What do you think determines the shape of enzymes?
The sequence (order) of amino acids in a
protein determine its shape
2) The shape of a protein determines its function

13. WHAT CHANGES? The enzyme doesn’t change, it can be reused!
A-B + H2O A + B
What reaction is this?
Hydrolysis

14. Some common enzymes
protease
PROTEIN AMINO ACIDS
Hydrolysis

15. Enzyme – Substrate Complex
Can you ID the substrate, product, enzyme, active site, & enzyme substrate complex?
Active Site
Enzyme – Substrate Complex
Substrate
Product
Enzyme