GCSE Biology – Enzymes

Last updated: 20/04/2020
CCEA GCSE Science – Combined science foundation Enzymes and digestion GCSE Biology – Enzymes

Learning Objectives

-I can describe how can enzyme works
-I can explain how an enzyme is affected at different temperatures and pH
-I can describe the ‘lock and key’ mechanism

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  3. Answered

  1. What is the definition of an enzyme?

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  2. What are enzymes?

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  3. What type of molecules are enzymes?

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  4. What type of catalysts are enzymes?

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  5. What is the name of the model for enzyme action?

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  6. Why is the model called “lock and key”?

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  7. What do enzymes do?

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  8. Why are enzymes not used up in reactions?

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  9. Although enzymes are not used up, what can happen?

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  10. What does “enzymes are specific” mean?

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  11. Why are enzymes specific?

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  12. What part of an enzyme is specific to the substrate (molecule being broken down)?

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  13. What happens when an active site is complementary to the substrate?

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  14. What happens when an active site is not complementary to the substrate?

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  15. What does a changed active site cause?

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  16. How is an enzyme denatured?

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  17. Once an enzyme is denatured,

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  18. Enzymes are

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  19. What happens when an enzyme is heated?

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  20. What is destroying an enzyme by heating called?

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  21. What is the optimum temperature for body enzymes?

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  22. What happens to rate of reaction of body enzymes when heated to 40 °C?

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  23. What happens when body enzymes are heated past 40 °C?

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  24. Why do body enzymes stop working over 40 °C?

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  25. What are the products of digestion nused for?

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