CAIE IGCSE Biology 5.1.6 Enzyme Action with Reference Questions
Practise explaining how the substrate, active site and enzyme-substrate complex work together to form product in an enzyme-controlled reaction.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- Identify the active site, substrate, enzyme-substrate complex and product in enzyme-action diagrams.
- Explain how complementary binding forms the enzyme-substrate complex and leads to products.
CAIE IGCSE Biology 5.1.6 Enzyme Action with Reference Questions question 1
[Maximum number: 6]
Pepsin is a protease enzyme found in the alimentary canal.
Enzymes, such as proteases, are important in digestion.
Describe in detail how enzymes function, using other digestive enzymes as examples.
enzymes are protein;
enzymes can be reused/are unchanged in the reaction;
enzymes are specific;
(enzymes are)catalysts/speeds up reaction;
lowers the energy needed for the reaction;
successful collisions/enzyme-substrate complex/ESC;
active site;
(enzyme and substrate) fit together;
complementary shape;
(digestive enzymes perform) chemical digestion / hydrolysis / catabolic reactions;
break down, large/insoluble, molecules into, small/soluble,
molecules;
amylase converts starch to sugars / maltose;
lipase converts lipid/fats, to fatty acids and glycerol;
maltase converts maltose to simple sugars/glucose;
ref to pH;
ref to denaturation;
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