Enzymes

Last updated: 12/03/2020

WJEC A-Level Chemistry Unit 4.7 – Amino acids, peptides and proteins Enzymes

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Question 1 of 18

1. Question
What is the definition of denaturing?
- When the shape of an enzyme changes causing it to lose its catalytic ability
- When an enzyme’s pH becomes too high, losing its catalytic ability
- When an enzyme freezes, losing its catalytic ability
- When an enzyme overheats, losing its catalytic ability
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Question 2 of 18

2. Question
What is the definition of the substrate?
- The reacting molecules
- The DNA within an enzyme
- The type of enzyme
- The area where an enzyme binds to a specific protein
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Question 3 of 18

3. Question
What is the definition of an active site?
- The area where an enzyme binds to a specific protein
- The area where an enzyme binds to water
- The substance an enzyme is made from
- The DNA within an enzyme
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Question 4 of 18

4. Question
What is the definition of activation energy?
- The minimum amount of energy needed for a reaction to take place
- The minimum amount of molecules needed for a reaction to take place
- The maximum amount of molecules needed for a reaction to take place
- The maximum amount of energy needed for a reaction to take place
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Question 5 of 18

5. Question
What is the definition of stereospecific?
- Sensitive to a certain shape of a substrate
- Sensitive to a certain type of protein
- Sensitive to a certain type of substrate
- Sensitive to a certain type of enzyme
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Question 6 of 18

6. Question
What do enzymes act as?
- Catalysts
- Acids
- Cells
- Bases
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Question 7 of 18

7. Question
Explain how an enzyme works.
- The substrate fits precisely into the active site of an enzyme
- Different types of substrate fit into the enzyme
- The active site fits precisely into the substrate of an enzyme
- The enzyme will latch onto the nearest protein
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Question 8 of 18

8. Question
How can the shape of an enzyme be changed?
- By changing the temperature
- By adding water
- By changing the volume
- By changing the pressure
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Question 9 of 18

9. Question
How can the shape of an enzyme be changed?
- By changing the pH
- By adding water
- By changing the volume
- By changing the pressure
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Question 10 of 18

10. Question
What type of molecules are enzymes mainly made from?
- Protein
- Oxygen
- Acid
- Water
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Question 11 of 18

11. Question
What type of protein molecules are found within an enzyme?
- Large
- Small
- Combined
- Distilled
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Question 12 of 18

12. Question
What shape are the protein molecules within an enzyme?
- Globular
- Round
- Dumbell
- Sphere
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Question 13 of 18

13. Question
What type of isomerism can enzymes catalyse?
- Optical isomerism
- Cis/trans isomerism
- E/Z isomerism
- Structural isomerism
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Question 14 of 18

14. Question
What happens when an enzyme is heated?
- Enzyme changes shape, losing the catalytic ability
- The enzyme will catalyse more efficiently
- Enzyme works faster
- Enzyme works slower
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Question 15 of 18

15. Question
What happens when the pH of an enzyme is altered?
- Enzyme changes shape, losing the catalytic ability
- The enzyme will catalyse more efficiently
- Enzyme works faster
- Enzyme works slower
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Question 16 of 18

16. Question
Which of the following statements is not true for an enzyme?
- They can never be destroyed
- They act as catalysts
- They contain proteins
- They contain a section called the active site
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Question 17 of 18

17. Question
Which of the following statements is true for an enzyme?
- The only stereoisomers that can be acted on by enzymes are optical isomers
- They all have a rounded shape
- Enzymes cannot be denatured
- Enzymes have a section called the substrate
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Question 18 of 18

18. Question
Describe the difference between the activation energy with the use of an enzyme compared to without.
- The activation energy is lower with the use of an enzyme
- The change in activation energy will depend on the type of enzyme used
- The activation energy is higher with the use of an enzyme
- The activation energy is the same
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