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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 are substances that speed up chemical reactions. decrease activation energy increase reaction rate.

francesca-hoffman
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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 are substances that speed up chemical reactions. • decrease activation energy • increase reaction rate

  3. 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.

  4. 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. • An enzyme’s function depends on its structure.

  5. Video clip (1:31 min) • http://player.discoveryeducation.com/index.cfm?guidAssetId=E9390E12-6035-41DD-9ADA-4DE9DDD53FE3&blnFromSearch=1&productcode=US

  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. • 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

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