GCSE Biology – Enzymes (Lock and key theory)
Learning Objectives
-I can describe how enzyme works
-I can describe the ‘lock and key’ mechanism
-I can explain how an enzyme is affected at different temperatures, substrate concentrations and pH
-I can calculate the rate of reaction for an enzyme catalysed reaction
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Question 1 of 28
1. Question
What do enzymes do?
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Question 2 of 28
2. Question
What type of molecule are enzymes?
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Question 3 of 28
3. Question
What does “enzymes are specific” mean?
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Question 4 of 28
4. Question
Why are enzymes specific?
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Question 5 of 28
5. Question
Why are enzymes not used up in reactions?
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Question 6 of 28
6. Question
Although enzymes are not used up, what can happen?
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Question 7 of 28
7. Question
What is the name of the model for enzyme action?
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Question 8 of 28
8. Question
Why is the model called lock and key?
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Question 9 of 28
9. Question
What part of an enzyme is specific to the substrate (molecule being broken down)?
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Question 10 of 28
10. Question
What happens when an active site is complementary to the substrate?
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Question 11 of 28
11. Question
What happens when an active site is not complementary to the substrate?
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Question 12 of 28
12. Question
What is the optimum temperature for body enzymes?
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Question 13 of 28
13. Question
What happens when body enzymes are heated past 40 °C?
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Question 14 of 28
14. Question
What happens to rate of reaction of body enzymes when heated to 40 °C?
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Question 15 of 28
15. Question
What happens when an enzyme is heated?
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Question 16 of 28
16. Question
Why do body enzymes stop working over 40 °C?
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Question 17 of 28
17. Question
What is destroying an enzyme by heating called?
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Question 18 of 28
18. Question
What does a changed active site cause?
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Question 19 of 28
19. Question
How is an enzyme denatured?
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Question 20 of 28
20. Question
Once an enzyme is denatured,
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Question 21 of 28
21. Question
Enzymes are
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Question 22 of 28
22. Question
What are the products of digestion used for?
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Question 23 of 28
23. Question
What can be found for an enzyme-catalysed reaction?
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Question 24 of 28
24. Question
What is used to measure the rate of an enzyme-catalysed reaction?
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Question 25 of 28
25. Question
What is measured when finding the rate of an enzyme-catalysed reaction?
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Question 26 of 28
26. Question
What is measured when finding the rate of an enzyme-catalysed reaction?
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Question 27 of 28
27. Question
What is the equation to find the rate of an enzyme-catalysed reaction?
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Question 28 of 28
28. Question
What is the equation to find the rate of an enzyme-catalysed reaction?
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