Enzymes. ENZYMES. An enzyme is a catalyst protein that changes the rate of a chemical reaction by lowering the amount of energy needed for reaction. Reaction involves: Enzyme - speed up reaction Active site – pockets specific to substrates
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Energy needed without the enzyme.
Energy needed with the enzyme.
It speeds reactions that would occur eventually anyway.
When a substrate binds to an enzyme, the enzyme catalyzes the conversion of the substrate to the product.
Enzymes have an active site
2. Each enzyme works for a specific substrate
3. The enzyme is unaffected by the reaction;
it is recycled.
This is an example of how the substrate binds to the active site.
Compare it to a “lock and key”
Enzyme Active Site
Enzyme – Substrate Complex
Enzymes are unaffected by the reaction and are recycled.
Help maintain homeostasis by speeding up metabolic chemical reactions.
Enzymes catalyze the thousands of reactions that need to take place in order to maintain life.
The rate of enzyme–catalyzed reactions depends on several factors.
Factors that affect the rate of a reaction include:
All enzymes work best at only one particular temperature and pH: this is called the optimum.
Different enzymes have different optimum temperatures and pH values.