Lesson Plan: Enzymes and Digestion Science

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to outline the role of enzymes in digestion; describe the location and action of carbohydrases, proteases, and lipases; and explain how bile helps digest fat.


Students will be able to

  • state that enzymes are biological catalysts that speed up chemical reactions inside living organisms, including the breakdown of food in the digestive system,
  • describe the location of carbohydrases, proteases, and lipases in the human digestive system,
  • outline how carbohydrases, proteases, and lipases break down carbohydrates, proteins, and fats respectively,
  • explain how bile from the liver helps lipase digest fat.


Students should already be familiar with

  • the fact that the human diet requires carbohydrates, proteins, and fats,
  • the organs of the digestive system.


Students will not cover

  • the lock-and-key or the induced-fit model of enzyme action,
  • optimum conditions for enzyme action,
  • denaturation of enzymes.

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