Objective: SWBAT describe the
importance of enzymes by examining
their roles in the human body.
SAT Word: dilemma (n) a difficult or
perplexing situation or problem
Drill:
1. What is the monomer for proteins?
2. What is the function of a protein?
3. What is an enzyme?
Key Vocabulary
• Enzyme
• Activation Energy
• Substrate
• Active Site
• Catalyst
Enzyme Lab
Notes
Enzymes
What is an enzyme?
• A type of protein used to
speed up chemical
reactions
• Acts as a catalyst
What is a catalyst?
• An enzyme that speeds
up chemical reactions
without being affected
• Works by lowering the
activation energy for
the reaction
What is activation energy?
• The energy needed to
start a chemical
reaction
Why do we need
enzymes?
• Without them, reactions
would occur so slowly
that organisms would not
be able to sustain life.
What are some
examples of enzymes?
• Lactase
• Catalase
• Amylase
• Polymerase
»Do you notice a pattern?
What are some
examples of enzymes?
• Lactase
• Catalase
• Amylase
• Polymerase
»Do you notice a pattern?
What does –ase indicate?
• The suffix –ase indicates
an enzyme
How do enzymes work?
• They are very specific
• They only work in certain
conditions, with certain
molecules
• The fit with the
molecules like a lock and
key
How do they work? Cont’d
• Enzymes bind with
molecules called
substrates
Active Site
• They bind at the
active site
• When they bind together,
it alters the substrate
causing a reaction
What types of things can
affect the functioning of an
enzyme?
• Temperature
• pH
• Inhibitors (things that block
the active site)
Enzymes and Substrates
SUBSTRATE
ENZYME AFTER REACTION
ENZYME
SUBSTRATE AFTER REACTION
Summary
Let’s go back to the objective:
SWBAT describe the importance of enzymes by
examining their roles in the human body.
~Was the objective met?
~What did you learn today?
Homework
Finish the analysis questions from the
Enzyme Lab