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The student is expected to: 9C identify and investigate the role of enzymes

The student is expected to: 9C identify and investigate the role of enzymes. KEY CONCEPT Enzymes are catalysts for chemical reactions in living things. A catalyst lowers activation energy. Copy graph. Catalysts are substances that speed up chemical reactions.

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The student is expected to: 9C identify and investigate the role of enzymes

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  1. The student is expected to:9C identify and investigatethe role of enzymes

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

  3. A catalyst lowers activation energy. Copy graph • Catalysts are substances that speed up chemical reactions. • decrease activation energy -energy required to start a reaction • increase reaction rate

  4. 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.

  5. Disruptions in homeostasis can prevent enzymes from functioning. • Enzymes function best in a small range of conditions. • Changes in temperature and pH can break hydrogen bonds = Denaturing the enzyme. • An enzyme’s function depends on its structure. • If it’s denatured then the function is lost.

  6. 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. Like a lock and key. • substrates • active site

  7. 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. • substrates brought together • bonds in substrates weakened Copy diagram

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