1. Warm-Up
Answer the following questions in complete sentences.
What is the bond called that connects amino acids? The bond that connects amino acids is a….

3. UNIT 3
Enzymes

4. All happens faster if an enzyme is involved!
UNIT 3
Enzymes
Energy
Enzymes make chemical reactions happen faster. (a reactant becomes a product).
Food
becomes O2
becomes*
CO2
Alcohol
becomes
All happens faster if an enzyme is involved!
waste in urine
*actually not true, wait until we talk about Photosynthesis and Cellular Respiration

5. UNIT 3
Enzymes
Enzymes make chemical reactions happen faster. (a reactant becomes a product).
Reactant = substrate
Energy
Food
becomes
Reactant
(substrate)
Product

6. UNIT 3
Enzymes
Enzymes make chemical reactions happen faster. (a reactant becomes a product).
Reactant = substrate
Specific enzymes react with specific substrates by binding (attaching) to them.
Hmm…
Mr. Enzyme
Food O2
Alcohol
Reactant
(substrate)
Product

7. UNIT 3
Enzymes
Enzymes make chemical reactions happen faster. (a reactant becomes a product).
Reactant = substrate
Specific enzymes react with specific substrates by binding (attaching) to them.
Mr. Enzyme
Food
I choose you, O2! O2
Alcohol
Reactant
(substrate)
Product

8. UNIT 3
Enzymes
Enzymes make chemical reactions happen faster. (a reactant becomes a product).
Reactant = substrate
Specific enzymes react with specific substrates by binding (attaching) to them.
The substrate fits in the enzyme like a key in a lock.

9. UNIT 3
Enzymes
Enzymes make chemical reactions happen faster. (a reactant becomes a product).
Reactant = substrate
Specific enzymes react with specific substrates by binding (attaching) to them.
The substrate fits in the enzyme like a key in a lock.
The part of the enzyme that fits with the substrate is called the active site.
active site
active site
active site

10. Summarize Your Notes-2 minutes
In one to two complete sentences, summarize the relationship between substrates, enzymes and active site. Please use the words “substrate,” “enzymes,” and “active site” in your sentence(s).

11. Enzymes 3 “Catalyze” = “speed up a reaction” UNIT With enzyme
Without enzyme
Amount of product
Time
Sometimes 1,000 times faster!

12. Enzymes 3 “Catalyze” = “speed up a reaction”
UNIT 3
Enzymes
“Catalyze” = “speed up a reaction”
The energy required to start a reaction is the activation energy.
Energy of Reaction
Activation Energy
reactant
product
Time

13. Enzymes 3 “Catalyze” = “speed up a reaction”
UNIT 3
Enzymes
“Catalyze” = “speed up a reaction”
The energy required to start a reaction is the activation energy.
Enzymes catalyze reactions by lowering the activation energy.
Energy of Reaction
Activation Energy w/ enzyme
reactant
product
Time

14. Enzymes 3 “Catalyze” = “speed up a reaction”
UNIT 3
Enzymes
“Catalyze” = “speed up a reaction”
The energy required to start a reaction is the activation energy.
Enzymes catalyze reactions by lowering the activation energy.
If the temperature rises too high, enzymes become denatured and no longer work.

15. Enzymes 3 “Catalyze” = “speed up a reaction”
UNIT 3
Enzymes
“Catalyze” = “speed up a reaction”
The energy required to start a reaction is the activation energy.
Enzymes catalyze reactions by lowering the activation energy.
If the temperature rises too high, enzymes become denatured and no longer work.

16. Summarize Your Notes- 3 minutes
In one to two complete sentences, summarize the relationship between enzymes, catalyze, activation energy, denaturation. Please use the words “enzymes,” “catalyze,” “activation energy” and “denaturation” in your sentence(s).

17. UNIT 3
Enzyme Video
Watch the video, and complete the following sentence in your notebook:
The substrate binds to the enzyme at the ________ _________.

18. Enzyme & Substrate Cutout Activity
Cut out each of the four different Pac-Man’s and each of their substrates.
On each Pac-Man, write “Enzyme (Protein)” and label the “Active Site”
On the others, write “Substrate”
Paste the Enzymes and Substrates into your notebook

19. Closure Answer the following question in a complete sentence:
Name/Nombre
Date/Fecha
Period ____
Answer the following question in a complete sentence:
Describe what it means for an enzyme to be specific to a substrate.
Suggested sentence stem:
An enzyme is “specific” to a substrate because…