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

What do you call catalysts found in living cells? 3. What do you call catalysts found in living cells? Answer: Enzymes W. McConnell 2004 Kinross High School

What type of chemical molecule are enzymes made up of? 4. What type of chemical molecule are enzymes made up of? Answer: Proteins W. McConnell 2004 Kinross High School

Why are enzymes vital to all living cells? 5. Why are enzymes vital to all living cells? Answer: Enzymes speed up chemical reactions. W. McConnell 2004 Kinross High School

What word describes the substance on which an enzyme works ? 6. 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. Answer: Synthesis reaction 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

What is meant by specificity of enzymes? 9. What is meant by specificity of enzymes? Answer: The enzyme will only work on one substrate W. McConnell 2004 Kinross High School

Name the substrate and end product for the enzyme amylase. 10. Answer: Substrate - End product - Starch Maltose W. McConnell 2004 Kinross High School

At what pH does catalase work best? 11. At what pH does catalase work best? Answer: pH 7 W. McConnell 2004 Kinross High School

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

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

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

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

16. Complete the table below showing enzymes and their substrates. amylase maltose pepsin protein glucose starch fatty acids and glycerol lipase W. McConnell 2004 Kinross High School

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

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 W. McConnell 2004 Kinross High School

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