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Enzymes are biological catalysts that speed up chemical reactions in living organisms. They operate on the “Lock & Key” model, where the active site of an enzyme attracts and holds only the substrate molecules with the correct shape. This specificity ensures efficient biochemical processes. Enzymes can be reused and require only small amounts to catalyze reactions. For example, lactase is an enzyme that breaks down lactose, a sugar found in milk, and catalase breaks down hydrogen peroxide in cellular processes. Heat can denature enzymes, causing them to lose their function.
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Question of the Day Question: What are enzymes? Describe. Answer: … … … • ’s Turn In: • p. 253 A.Q. #1ab, 2ab, 3ab, 4
Reminders • Test corrections • Biospheres! Week 5
Enzymes • “Lock & Key”Model • Active site- attracts and holds only molecules that have the right shape • Substrate-molecule that is changed by the enzyme; must have the right shape
Enzymes • Heat can denature (misshapen) enzymes • Can be used again and again • Only need a small amount of enzymes
Enzyme Example: Lactase • Lactose= sugar found in milk products • Lactase= enzyme that breaks down lactose
