Lesson Plan: B1.3.04

Hamble Lesson Observation Plan
Learning About
How do enzymes aid in digestion?
Keywords:
  • Active Site: The part of the enzyme that the substrate binds to. (1)
  • Substrate: The reactant or reactants that the enzyme catalases the reaction for. (1)
  • Lock and Key: The specific way that the exact substrate fits the exact enzyme. (1)
  • Enzyme: Proteins that act as biological catalysts, each specific for a certain metabolic reaction. (1)
Memory Anchor:
Method Precise Learning Objective Linked Question / Activity
(Designed for maximum working out)		 Stepping Stones Pitstop Check
(Thinking Map)
Students should be able to describe the nature of enzyme molecules and relate their activity to temperature and pH changes. How does temperature and pH affect the activity of enzymes?
Students should be able to carry out rate calculations for chemical reactions. How do you calculate a rate of reaction?
Enzymes catalyse specific reactions in living organisms due to the shape of their active site. What is the most important part of the enzyme with regartds to its shape?
Students should be able to use the ?lock and key theory? as a simplified model to explain enzyme action. The binding of the substrate with the active site is known as what theory?
Students should be able to recall the sites of production and the action of amylase, proteases and lipases. Where are amylase, protease and lipases created in the body?

Demo: how the rate of the catalase reaction can be measured using a gas syringe or inverted cylinder of water and timer to prepare for the Required practical next lesson.
Students should be able to understand simple word equations but no chemical symbol equations are required.

Digestive enzymes convert food into small soluble molecules that can be absorbed into the bloodstream. Why are enzymes needed in digestion?
Carbohydrases break down carbohydrates to simple sugars. What do carbohydrases break carbohydrates down to?
Amylase is a carbohydrase which breaks down starch. What does the carbohydrase amylase break down?
Proteases break down proteins to amino acids. What do proteases break proteins down into?
Lipases break down lipids (fats) to glycerol and fatty acids. What do lipases break fat/lipids down into?

Describe the role of different enzymes in the digestive system including the substrates and products as well as their locations in the body. Explain why pepsin (protease) works in the stomach but trypsin (from the small intestine) wouldn't and vice versa
Links To the Big Ideas
ForcesParticlesEnergyCells