Web-Based Activity:
Guided Notes on Enzymes
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Go to “LewPort enzymes” (first link on google)
http://www.lew-port.com/10712041113402793/lib/10712041113402793/Animations/Enzyme_activity.html
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Read aloud the blue text on each slide
Use this info to fill in the Notes column on the back of
your worksheet
Then use the animations on the Enzyme Menu to fill in
drawings or descriptions in the Evidence column
We will do the first one together…
You will work quietly w/ your assigned partner to
complete the rest.
Objectives for Class:
 Describe what an enzyme does and how it works
 Explain why an enzyme’s shape is so important
Chemical Reaction Vocabulary:
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Chemical Reaction:
Process that changes or transforms one substance into
another
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Either to build something from smaller pieces – Synthesis
Or to break something down – Decomposition
Ex: glucose + O2
CO2 + H2O + ATP energy + heat
 Enzyme:
A protein that speeds up chemical reactions in living things
(the “catalysts” in our cells and bodies)
Objectives for Class:
 Describe and illustrate chemical reactions, reactants, products, and enzymes
 Explain how enzymes work to catalyze reactions
 Use a knowledge of enzymes to predict what will happen in tomorrow’s lab
Chemical Reaction Vocabulary continued:
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Reactants:
the starting materials in a chemical reaction
(also known as substrates)
Products:
substances that are produced in the chemical reaction
(the end result)
Objectives for Class:
 Describe and illustrate chemical reactions, reactants, products, and enzymes
 Explain how enzymes work to catalyze reactions
 Use a knowledge of enzymes to predict what will happen in tomorrow’s lab
Example: Lipid Digestion
The enzyme lipase helps to break down lipids into their
building block molecules (fatty acids and glycerol)
Enzyme – Lipase
Reactant (aka Substrate) – Lipids
Products – Fatty acids and glycerol
Lipids
Substrate/
Reactant
Lipase
Enzyme helps substrate
turn into products
Fatty acids + glycerol
Products
Objectives for Class:
 Describe and illustrate chemical reactions, reactants, products, and enzymes
 Explain how enzymes work to catalyze reactions
 Use a knowledge of enzymes to predict what will happen in tomorrow’s lab
Example: Lipid Digestion
Which enzyme is best structured to
help break down lipids? Why?
1
2
3
Objectives for Class:
 Describe and illustrate chemical reactions, reactants, products, and enzymes
 Explain how enzymes work to catalyze reactions
 Use a knowledge of enzymes to predict what will happen in tomorrow’s lab
Example: Lipid Digestion
Which enzyme is best structured to
help break down lipids? Why?
The SHAPE of an enzyme must
match the SHAPE of its
specific substrates!
2
Objectives for Class:
 Describe and illustrate chemical reactions, reactants, products, and enzymes
 Explain how enzymes work to catalyze reactions
 Use a knowledge of enzymes to predict what will happen in tomorrow’s lab
Enzyme Lab: Starch Digestion
STARCH
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GLUCOSE
Procedure
*Stir the starch
well before
using it!
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salivary amylase
Starch &
Water
1
2
Starch &
Water &
Enzyme
(salivary
amylase)
Prediction:
Which tube will contain glucose after 10
minutes? Fill in the Prediction row on your lab
table right now.
Results: How will we know? Benedict’s test
Enzyme
Substrate
Products
Applying Heat or Acid to
Enzymes…
Denaturing Enzymes
When an enzyme is denatured, it…
 Becomes misshapen and deformed
 Loses its original shape
 Becomes unable to speed up the reaction it is
designed for, because its shape no longer matches
its substrate