1. Revision Questions on Enzymes
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2. 1. What is a catalyst? Answer:
A chemical which will speed up a chemical reaction.
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3. What effect does catalase have on hydrogen peroxide? 2.
Answer:
It breaks it down to
water and oxygen.
W. McConnell 2004 Kinross High School

4. What do you call catalysts found in living cells?3.
What do you call catalysts found in living cells?
Answer:
Enzymes
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5. What type of chemical molecule are enzymes made up of?4.
What type of chemical molecule are enzymes made up of?
Answer:
Proteins
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6. Why are enzymes vital to all living cells?5.
Why are enzymes vital to all living cells?
Answer:
Enzymes speed
up chemical reactions.
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7. What word describes the substance on which an enzyme works ? 6.
Answer:
Substrate
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8. 7.
Name the area on the enzyme molecule where the chemical reaction takes place.
Answer:
Active site
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9. 8. Answer: Synthesis reaction
What type of reaction is taking place when small soluble molecules are built up into large insoluble molecules?
Answer:
Synthesis reaction
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10. What is meant by specificity of enzymes?9.
What is meant by specificity of enzymes?
Answer:
The enzyme will
only work on one
substrate
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11. Name the substrate and end product for the enzyme amylase. 10.
Answer:
Substrate -
End product -
Starch
Maltose
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12. At what pH does catalase work best?
11.
At what pH does catalase work best?
Answer:
pH 7
W. McConnell 2004 Kinross High School

13. What does the enzyme phosphorylase do?
12.
What does the enzyme phosphorylase do?
Answer:
Builds glucose molecules into starch molecules.
W. McConnell 2004 Kinross High School

14. 13.
When a lump of liver was placed in a test tube with hydrogen peroxide, many gas bubbles were seen rising to the surface.
an enzyme
This showed that liver contained ……………… which
acted as a biological …………… because it increased the
rate of a chemical reaction.
A control for this experiment would have everything the
same except there would be no ………………
catalyst
liver
W. McConnell 2004 Kinross High School

15. 14.
Why is starch not broken down to sugar if pepsin was used instead of amylase?
Answer:
Enzymes are specific and each one only works on one substrate. Pepsin does not act on starch.
W. McConnell 2004 Kinross High School

16. Protein + pepsin peptide
15.
What substrate does pepsin act on?
Pepsin acts on protein
What reaction does it catalyse ?
Protein + pepsin peptide
W. McConnell 2004 Kinross High School

17. 16. Complete the table below showing enzymes and their substrates.
amylase
maltose
pepsin
protein
glucose
starch
fatty acids and glycerol
lipase
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18. 17. true false true true false true
Say whether the statements below are true of false
Enzymes are destroyed when they act as catalysts
All enzymes are catalysts
All catalysts are enzymes
The pH scale measures the acidity of a solution
Phosphorylase is a catalyst
Phosphorylase is not present in growing potatoes
Enzymes are inactive in dead tissues
false
true
false
true
true
false
true
W. McConnell 2004 Kinross High School

19. Name 2 places in the human body where amylase is made?
18.
Name 2 places in the human body where amylase is made?
Salivary glands in the mouth
Pancreas
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W. McConnell 2004 Kinross High School