Digestive Enzymes
Digestive enzymes such as amylase, protease and lipase break large food molecules into smaller ones that can be absorbed.
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Digestive enzymes such as amylase, protease and lipase break large food molecules into smaller ones that can be absorbed.
- Amylase breaks down starch to sugars
- Protease breaks proteins into amino acids
- Lipase breaks fats into fatty acids and glycerol
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Digestive Enzymes?
Within Biology, which covers cells, the human body, genetics, evolution, plants and ecosystems: the science of living things, this topic explains Digestive Enzymes. Biology topics show how living things work, from the cell up to whole ecosystems, with models you can explore step by step.
Check that you can explain Digestive Enzymes in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Digestive Enzymes helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.
Digestive Enzymes in detail
Digestive enzymes break large insoluble molecules into small soluble ones. Carbohydrase (amylase) breaks starch into sugars, proteases break proteins into amino acids and lipases break lipids into fatty acids and glycerol.
Amylase is made in the salivary glands and pancreas, protease in the stomach (pepsin) and pancreas, and lipase in the pancreas. Bile, made in the liver and stored in the gall bladder, is not an enzyme, but it neutralises stomach acid and emulsifies fats, increasing their surface area for lipase to work on. Each enzyme works best at its own optimum pH.
How the interactive helps you understand Digestive Enzymes
Watch the reaction model in the interactive. Use any sliders or buttons it offers to change the values and see how the reaction model responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Digestive Enzymes.
Real-life uses and examples
- Use Digestive Enzymes to interpret a diagram, graph or microscope image from a practical.
- Structure a longer answer about Digestive Enzymes by moving from definition to example to consequence.
- Explain how Digestive Enzymes helps a living thing stay alive, using a plant or animal example.
Common mistakes to avoid
- Using everyday words, such as “energy” or “bad”, without their scientific meaning.
- Listing the steps of a process without saying how one step causes the next.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Digestive Enzymes
What is Digestive Enzymes?
Digestive enzymes such as amylase, protease and lipase break large food molecules into smaller ones that can be absorbed.
What are the most important points about Digestive Enzymes?
The main points are: Amylase breaks down starch to sugars; Protease breaks proteins into amino acids; Lipase breaks fats into fatty acids and glycerol.
Why is Digestive Enzymes useful?
Understanding Digestive Enzymes helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.
How can I practise Digestive Enzymes?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Digestive Enzymes?
Related topics in Biology include Limiting Factors of Photosynthesis, Plant Minerals and Hormones, Seed Germination.