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Why are enzymes important to
living things?
Check your neighbor
• An enzyme is made from which of the
following biomolecules?
•
•
•
•
Carbohydrate
Lipid
Protein
Nucleic Acid
What Happens When Matter Changes?
• Energy is the ability to change or move matter
Type of Change
Description
Examples
Chemical Change
A substance changes into
another substance
Burning wood, cooking
food, rust,
Only the form of the
substance changes
Melting ice, boiling water,
chopping wood, dissolving
salt in water, watermelon
drop
AKA Chemical Reaction
Physical Change
Exit Ticket
• Describe the difference between a physical
change and a chemical change and give one
example of each.
What is a Chemical Reaction?
• A chemical change
• Reactants  Products
• CO2 + H2O  C6H12O6 + O2
• Reactants- substance(s) that are changed
• Products- the new substances that are formed
•  means changes or forms (yields)
Law of Conservation of Matter
• Matter cannot be created or destroyed in a
chemical reaction
• Equations must be balanced, has the same
number of each element on side of the
equation.
• EX. Mg + O2  MgO
Exit ticket
• What are the reactants and products in this
equation? Is it balanced?
• CH4 + O2  CO2 + H2O
What is a Chemical Reaction?
• Metabolism – total of all chemical reactions that
occur in an organism
• Energy is released (exothermic) from these
reactions & or taken in (endothermic)
• Activation Energy - amount needed for a
reaction to occur
• Types of Reactions in Organisms
Synthesis “building up”
Decomposition “Breaking-down”
What is an Enzyme & how do they
promote reactions?
• Catalyst- reduce the amount of energy needed
for a reaction
• Enzyme – a protein that acts as a catalyst in two
ways
1. lowers activation energy needed
2. binds reactants together
Active Site – place where reactant can bind
Substrates – substances (reactants) that can bind to
a specific enzyme
Exit Ticket
• Summarize what you learned about enzymes.
Include: What are they?
What do they do?
Why are they important to living things?