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Revision Questions on Enzymes

Revision Questions on Enzymes. 1. What is a catalyst?. Answer :. A chemical which will speed up a chemical reaction. What effect does catalase have on hydrogen peroxide?. 2. Answer:. It breaks it down to water and oxygen. 3. What do you call catalysts found in living cells?. Answer:.

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Revision Questions on Enzymes

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  1. Revision Questions on Enzymes

  2. 1. What is a catalyst? Answer: A chemical which will speed up a chemical reaction.

  3. What effect does catalase have on hydrogen peroxide? 2. Answer: It breaks it down to water and oxygen.

  4. 3. What do you call catalysts found in living cells? Answer: Enzymes

  5. 4. What type of chemical molecule are enzymes made up of? Answer: Proteins

  6. 5. Whyare enzymes vital to all living cells? Answer: Enzymes speed up chemical reactions.

  7. What word describes the substance on which an enzyme works ? 6. Answer: Substrate

  8. 7. Name the area on the enzyme molecule where the chemical reaction takes place. Answer: Active site

  9. 8. What type of reaction is taking place when small soluble molecules are built up into large insoluble molecules? Answer: Synthesis reaction

  10. 9. What is meant by specificity of enzymes? Answer: The enzyme will only work on one substrate

  11. Name the substrate and end product for the enzyme amylase. 10. • Answer: • Substrate - • End product - Starch Maltose

  12. 11. At what pH does catalase work best? Answer: pH 7

  13. 12. What does the enzyme phosphorylase do? Answer: Builds glucose molecules into starch molecules.

  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

  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.

  16. 15. What substrate does pepsin act on? Pepsin acts on protein What reaction does it catalyse ? Protein + pepsin peptide

  17. 16. Complete the table below showing enzymes and their substrates. amylase maltose pepsin protein glucose starch fatty acids and glycerol lipase

  18. 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 false true false true true false true

  19. 18. Name 2 places in the human body where amylase is made? • Salivary glands in the mouth • Pancreas

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