A Level biology – Enzyme action

Last updated: 20/02/2020

AQA A-Level Biology Proteins A Level biology – Enzyme action

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Question 1 of 22

1. Question
Which of these proteins are referred to as biological catalysts.
- Enzymes
- Hormones
- Transport Proteins
- Structural Proteins
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Question 2 of 22

2. Question
Which of the following is the best description of enzymes?
- They decrease the activation energy of a reaction
- They increase the activation energy of a reaction
- They are not affected by temperature
- They work for many reactions
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Question 3 of 22

3. Question
The region of an enzyme where the substrate fits is known as what?
- Active site
- Activation site
- Jigsaw
- Key
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Question 4 of 22

4. Question
Which of the following is not a limitation of the lock and key model?
- It does not result in the formation of an enzyme-substrate complex
- It does not easily explain how activation energy is lowered
- It does not easily explain the role of competitive inhibitors
- It does not easily explain the role of non-competitive inhibitors
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Question 5 of 22

5. Question
Describe a way in which the induced-fit model is better than the lock and key model?
- It describes a more dynamic interaction between enzyme and substrate
- It doesn’t result in ideal binding
- It describes a less dynamic interaction between enzyme and substrate
- It takes into enzyme concentration into account
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Question 6 of 22

6. Question
What do we call the molecule(s) that result after interaction with an enzyme?
- Products
- Substrate
- Active site
- Reactants
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Question 7 of 22

7. Question
What do we call the molecule that fits into the active site of the enzyme?
- Substrate
- Reactants
- Products
- Catalysts
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Question 8 of 22

8. Question
Where do competitive inhibitors bind?
- The active site
- The activation site
- Region away from the active site
- Region away from the activation site
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Question 9 of 22

9. Question
Where do non-competitive inhibitors bind?
- Region away from the active site
- The active site
- The activation site
- Region away from the activation site
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Question 10 of 22

10. Question
Which factor causes increased kinetic energy?
- Increased temperature
- Increased pH
- Increased enzyme concentration
- Increased substrate concentration
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Question 11 of 22

11. Question
Which factor causes a change in the charge at the active site and affects the binding of the substrate?
- Increased pH
- Increased enzyme concentration
- Increased product concentration
- Increased substrate concentration
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Question 12 of 22

12. Question
Which factor causes more enzyme-substrate complexes to be formed as a result of greater kinetic energy?
- Increased temperature
- Increased enzyme concentration
- Increased pH
- Increased substrate concentration
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Question 13 of 22

13. Question
What is the term used to describe the minimum amount of energy needed to start a chemical reaction?
- Activation energy
- Activity energy
- Motivation energy
- Reactivation energy
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Question 14 of 22

14. Question
Which of the following best describes the role of a catalyst?
- Alters the rate of a chemical reaction without undergoing permanent change itself
- Alters the rate of a chemical reaction but undergoes permanent change itself
- Provides energy for a chemical reaction to occur
- Derives energy from an occuring chemical reaction
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Question 15 of 22

15. Question
What do enzymes do to the activation energy for the chemical reactions they catalyse?
- They lower it
- They increase it
- They have no effect on it
- They cleave it
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Question 16 of 22

16. Question
Which of the following statements is not true?
- All enzymes work best at 37°C
- All enzymes speed up reactions that already occur
- All enzymes are catalysts
- All enzymes lower the activation energy of a reaction
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Question 17 of 22

17. Question
Which of the following best explains why an enzyme can be effective even when present in very low amounts?
- They are not modified during their action and can catalyse many rounds of a reaction
- Each enzyme contains many active sites and can act on multiple substrates at a time
- They have a high kinetic energy and can move rapidly to access substrate quickly
- They bind substrate very tightly and so do not accidentally let go before they can complete a reaction
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Question 18 of 22

18. Question
Which of the following replaced the lock and key model for explaining enzyme action?
- Induced fit model
- Forced fit model
- Rigid fit model
- Reduced fit model
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Question 19 of 22

19. Question
Which of these statements is not true?
- The substrate has the same shape as the active site
- The substrate has a complementary shape to the active site
- In the active site, the substrate forms an enzyme-substrate complex
- The active site is flexible and can mould itself around the substrate
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Question 20 of 22

20. Question
Changing a single amino acid in the active site of an enzyme….
- May stop the enzyme from functioning by preventing substrate binding
- Will stop the enzyme from functioning by preventing substrate binding
- Will have no effect on enzyme function
- May stop the enzyme from functioning by altering substrate concentration
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Question 21 of 22

21. Question
Changing a single amino acid in the active site of an enzyme….
- May either increase or decrease enzyme activity
- Will always decrease enzyme activity
- Will always increase enzyme activity
- Will never affect enzyme activity
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Question 22 of 22

22. Question
Changing a single amino acid outside of the active site…
- May affect enzyme activity
- Will not affect enzyme activity
- Will decrease substrate concentration
- Will increase substrate concentration
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