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Lesson #11: Enzymes in digestion. Objective: - Identify the main enzymes in digestion and their functions. Practical. Label the boiling tubes A & B Fill each tubing with 8ml of starch . Wash one of the tubes very well and place it in boiling tube A. - PowerPoint PPT Presentation
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Lesson #11: Enzymes in digestion
Objective:- Identify the main enzymes in digestion and their functions
Practical1. Label the boiling tubes A & B2. Fill each tubing with 8ml of starch.3. Wash one of the tubes very well and place it in boiling
tube A.4. Add 3ml of amylase solution in the other tube. Shake.
Wash very well and place in boiling tube B.5. Place both boiling tubes in the water bath for 30
minutes.6. Test the water in the boiling tube for starch and
glucose using iodine and benedict’s solution7. Record your results.
Digestive Enzymes• There are 3 main types of digestive enzymes:
Enzyme Reaction catalysed Where produced
Amylase Starch → sugars Salivary glands, pancreas, small intestine
Protease Proteins → amino acidsStomach, pancreas, small intestine
Lipase Lipids → fatty acids + glycerol Pancreas, small intestine
Digestive Enzymes
Amylase
StarchGlucose
Protease
ProteinAmino Acids
Digestive Enzymes
Glycerol
Fatty Acid
Fatty Acid
Fatty Acid
Glycerol
Fatty Acid
Fatty Acid
Fatty Acid
Lipase
Fat Fatty Acids and Glycerol
The enzyme fits over the substrate perfectly – like a key fits a lock.
It holds the starch molecule in place as a water molecule breaks the bond between two glucose particles
Starch molecule
Amylase enzyme
This continues until the molecule has been broken down completely
Chemical digestion:• Salivary amylase: starch maltose• Pepsin in stomach: protein peptides• Pancreatic amylase: starch maltose• Trypsin from the pancreas: protein peptides• Lipase from the pancreas: fats glycerol + fatty acids
Digestion Summary
What factors affect the rate of reaction of enzymes
• How do you think you can speed up the rate of an enzymic reaction?(Hint: It’s the same as any other reaction!)
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