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W. McConnell 2004 Kinross High School
Revision Questions on Enzymes
W. McConnell 2004 Kinross High School
1.What is a catalyst?
Answer:
A chemical which will speed up a chemical reaction.
W. McConnell 2004 Kinross High School
What effect does catalase have on hydrogen peroxide?
2.
Answer:
It breaks it down to
water and oxygen.
W. McConnell 2004 Kinross High School
3.
Answer:
What do you call catalysts found in living cells?
Enzymes
W. McConnell 2004 Kinross High School
4.What type of chemical molecule are enzymes made up of?
Answer: Proteins
W. McConnell 2004 Kinross High School
5.Why are enzymes vital to all living cells?
Answer:
Enzymes speed
up chemical reactions.
W. McConnell 2004 Kinross High School
6. What word describes the substance on which an enzyme works ?
Answer:
Substrate
W. McConnell 2004 Kinross High School
7. Name the area on the enzyme molecule where the chemical reaction takes place.
Answer: Active site
W. McConnell 2004 Kinross High School
8. What type of reaction is taking place when small soluble molecules are built up into large insoluble molecules?
Answer: Synthesis reaction
W. McConnell 2004 Kinross High School
9. What is meant by specificity of enzymes?
Answer:
The enzyme will
only work on one
substrate
W. McConnell 2004 Kinross High School
10. Name the substrate and end product for the enzyme amylase.
Answer:
•Substrate -
•End product -
Starch
Maltose
W. McConnell 2004 Kinross High School
11.At what pH does catalase work best?
Answer:pH 7
W. McConnell 2004 Kinross High School
12.What does the enzyme phosphorylase do?
Answer:
Builds glucose molecules into starch molecules.
W. McConnell 2004 Kinross High School
13.
When a lump of liver was placed in a test tube with hydrogen peroxide, many gas bubbles were seen rising to the surface.
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 ………………
an enzyme
catalyst
liver
W. McConnell 2004 Kinross High School
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
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
16. Complete the table below showing enzymes and their substrates.
Enzyme Substrate End Products
starch
peptide
phosphorylase
fat
amylase
pepsin
lipase
maltose
starch
fatty acids and glycerol
protein
glucose
W. McConnell 2004 Kinross High School
17. 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
true
false
false
true
true
false
true
W. McConnell 2004 Kinross High School
18. Name 2 places in the human body where amylase is made?
•Salivary glands in the mouth
•Pancreas
W. McConnell 2004 Kinross High School
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