Chapter 2.5 Enzymes PDF
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This document provides an overview of enzymes and their function as catalysts in biological systems. It details how enzymes lower activation energy and the lock-and-key model of enzyme function, along with discussion of homeostasis and enzymes.
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CHAPTER 2 Chemistry of Life 2.5 Enzymes KEY CONCEPT Enzymes are catalysts for chemical reactions in living things. A catalyst lowers activation energy. Catalysts are substances that speed up chemical reactions. decrease activation energy increase reaction rate Enzymes al...
CHAPTER 2 Chemistry of Life 2.5 Enzymes KEY CONCEPT Enzymes are catalysts for chemical reactions in living things. A catalyst lowers activation energy. Catalysts are substances that speed up chemical reactions. decrease activation energy increase reaction rate Enzymes allow chemical reactions to occur under tightly controlled conditions. Enzymes are catalysts in living things. Enzymes are needed for almost all processes. Most enzymes are proteins – Homeostasis and enzymes. – Large changes in temp or pH can cause enzymes to break down; an organism needs to be able to maintain homeostasis to function properly. An enzyme’s structure allows only certain reactants to bind to the enzyme. – Substrates substrates (reactants) – Bind to an enzymes active sites – active site enzyme Substrates bind to an enzyme at certain places called active sites. The lock-and-key model helps illustrate how enzymes function. – Only particular substrates will bind to particular enzymes. Like a key into a specific lock. Substrates bind to an The enzyme brings The catalyzed reaction forms enzyme at certain substrates together a product that is released places called active and weakens their from the enzyme. sites. bonds.
