1. 1.4 Properties of Enzymes

2. Warm up – Day 1 What determines a protein’s shape?
Why do you think shape is important?

3. Toothpick-ase Today your hands will be enzymes.
You will see what can affect the activity of an enzyme.
Read the background section and fill out the Checkpoint.
Have me check it off, then you can get your supplies.

4. Warm up – Day 2
Get out your Key Terms sheet. Which terms did you have a hard time defining? Compare with your neighbors and try to complete the sheet.

5. WRITE FOLLOWING 5 QUESTIONS IN YOUR LOGBOOK—LEAVE ENOUGH ROOM FOR YOUR ANSWERS!
1. What is the difference in a reaction with or without an enzyme?
Why can an enzyme help only one reaction?
How can an enzyme be used repeatedly in a reaction?
What happens to an enzyme when it is heated or placed in acid?
List 4 properties of enzymes

6. Enzyme Animations

7. Without an enzyme

8. With an enzyme-
The molecules can line up correctly and perform the reaction easily.

9. Enzymes are specific They have a certain shape that only fits one type of molecule.

10. How can an enzyme be reused repeatedly?

11. What happens when it is heated or placed in acid?
The shape of the enzyme changes and the molecules do not fit into the enzyme anymore.

12. 4 Properties of Enzymes
Enzymes speed up the rate of chemical reactions
Enzymes are NOT used up in the chemical reaction
Only small amounts are needed since they are recycled and reused

13. Enzymes are specific to one type of chemical reaction
Only lactose fits inside lactase
4) Enzymes are denatured (stop working because of shape change) when they are heated or placed in acid.

14. Yummy Proteins JELL-O is made of gelatin (a protein)
Gelatin comes from bones and cartilage.
600 million pounds of gelatin is made every year (not all for JELL-O)

15. Yummy Tropical Fruits
Have protein-breaking enzyme called papain or bromelain.
Used as meat tenderizer.`

16. JELL-O and fruit - Predictions
Cooked pineapple
Fresh pineapple
No fruit
yes _____
yes _____
yes _____
Solid?
no _____
no _____
no _____
In your logbook, write down what you think will happen in each container of JELL-O. Solid or not?

17. JELL-O and fruit - Results
Cooked pineapple
Fresh pineapple
No fruit
yes _____
yes _____
yes _____
Solid?
no _____
no _____
no _____
In your logbook, write down what you think will happen in each container of JELL-O. Solid or not?

18. Idea Journal In the Lesson 1.4 box:
Draw a model of a fresh pineapple cell and a canned pineapple cell. Explain what causes the difference between the two.
Fresh Pineapple Cell
Draw the cells
Draw the substrate (THINK: what molecule did the enzyme break down in the Jell-O?)
Draw the enzyme in each cell – fresh and cooked
Be sure the active site of the enzyme matches the substrate!
Cooked Pineapple Cell