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KEY CONCEPT Enzymes are catalysts for chemical reactions in living things.

KEY CONCEPT Enzymes are catalysts for chemical reactions in living things. A catalyst lowers activation energy. Catalysts - substances that speed up chemical reactions. 1.Decreases activation energy and increase reaction rate. 2.Is not used up and does not alter equilibrium.

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KEY CONCEPT Enzymes are catalysts for chemical reactions in living things.

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  1. KEY CONCEPTEnzymes are catalysts for chemical reactions in living things.

  2. A catalyst lowers activation energy. • Catalysts - substances that speed up chemical reactions. 1.Decreases activation energy and increase reaction rate. 2.Is not used up and does not alter equilibrium.

  3. Enzymes allow chemical reactions to occur under tightly controlled conditions. • Enzymes: • Are proteins • Are catalysts • Enzymes are needed for almost all processes.

  4. substrates (reactants) enzyme Substrates bind to anenzyme at certain places called active sites. • An enzyme’s structure allows only certain reactants to bind to the enzyme. • Substrates-reactants acted upon by an enzyme binds to the active site.

  5. Substrates bind to anenzyme at certain places called active sites. The enzyme bringssubstrates together and weakens their bonds. The catalyzed reaction formsa product that is releasedfrom the enzyme. • The lock-and-key model helps illustrate how enzymes function. • Only a particular substrate will bind to a particular enzyme. • bonds in substrates weakened

  6. Homeostasis and Enzymes • Large changes in pH or temperature can cause enzymes to break down by breaking the hydrogen bonds. Protein becomes denatured-no longer functional • Enzyme structure and function • Enzymes function best in a small range of conditions. • Theme- function depends on its structure.

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