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Transcript
SB1b - Enzymes
SB1c - Macromolecules
Test Review
Enzymes
• Why is an enzyme such as lactase called a catalyst?
– Because it helps a chemical reaction take place
• What is activation energy (EA)?
– The energy needed to start a chemical reaction
Enzymes
• On the graph, label the x-axis “Progress of the
reaction” and the y-axis “Free Energy.” Label EA on
this sketch, both with and without enzyme.
What effect does an
enzyme have on EA?
An enzyme lowers the EA
Enzymes
• Label this figure while you define each of the
following terms:
•
•
•
•
enzyme – breaks down or assembles substrates
substrates
substrate – molecule that an enzyme acts on
active site - part of the enzyme that binds to substrate
products - molecules formed after chemical reaction
enzyme
Active site
products
Enzymes
• Many factors can affect the rate of enzyme
function. These factors include the
concentration of substrate, pH, and
temperature. Explain how.
– These factors may alter the shape of the enzyme or delay
with the formation of an Enzyme-Substrate Complex
Macromolecules
Biological
Macromolecule
Carbohydrate
Function
Monomer
Short term energy
storage
Structure (cell
walls &
exoskeletons)
Examples
Glycogen
Monosaccharide
Cellulose
(Glucose)
sucrose
lactose
Lipids
Store energy
Insulate
Oil
Fatty Acids
Waterproof
Proteins
Cholesterol
Form muscles
Act as hormones
Wax
Insulin
Amino Acids
Lactase
Catalyze reactions
Catalase
Store genetic
information
DNA
Nucleic Acids
Nucleotides
RNA