| 1. | Chemical reactions can be speeded up by | |
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A. | decreasing the temperature |
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B. | adding a catalyst |
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C. | adding detergent |
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D. | adding hydrogen peroxide |
| 2. | When hydrogen peroxide breaks down it forms | |
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A. | hydrogen and oxygen |
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B. | water, hydrogen and foam |
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C. | foam and water |
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D. | oxygen and water |
| 3. | One of the properties of enzymes in the initiation of chemical reactions is that an enzyme | |
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A. | does not alter the energy input required |
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B. | raises the energy input required |
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C. | lowers the energy input required |
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D. | raises then lowers the energy input |
| 4. | Which term refers to the process by which complex molecules are formed from simple molecules? | |
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A. | Digestion |
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B. | Synthesis |
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C. | Degradation |
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D. | Respiration |
| 5. | Which of the following correctly describes amylase? | |
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A. | It breaks down starch into amino acids. |
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B. | It builds up glucose-1-phosphate into |
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C. | It breaks down proteins into peptides. |
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D. | It breaks down starch into maltose. |
| 6. | What general effect do catalysts have on chemical reactions? | |
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A. | they speed them up |
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B. | they stop them happening |
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C. | they keep them going for longer |
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D. | they slow them down |
| 7. | After the breakdown of hydrogen peroxide, the catalyst manganese dioxide | |
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A. | changes its colour |
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B. | changes its mass |
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C. | is unchanged by the reaction |
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D. | is used up by the reaction |
| 8. | What is the general term for a biological catalyst? | |
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A. | enzyme |
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B. | catalase |
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C. | manganese dioxide |
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D. | detergent |
| 9. | Enzymes are found | |
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A. | in plant cells only |
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B. | in animal cells only |
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C. | in liver and potato cells only |
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D. | in all cells |
| 10. | What are all enzymes made of? | |
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A. | carbohydrate |
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B. | protein |
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C. | fat |
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D. | starch |
| 11. | Enzymes are described as being “specific”. This means that they | |
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A. | operate in only one place |
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B. | are unique to one organism |
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C. | work at only one temperature |
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D. | work on only one substrate |
| 12. | The chemical that an enzyme works on is called its | |
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A. | substrate |
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B. | substance |
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C. | product |
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D. | project |
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| 13. | The part of an enzyme which binds on to the substrate is called the | |
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A. | enzymatic site |
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B. | active site |
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C. | catalytic site |
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D. | reaction site |
| 14. | Which term compares an enzyme’s active site to its substrate? | |
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A. | complementary |
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B. | compensatory |
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C. | supplementary |
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D. | reflectory |
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| 15. | An enzyme will work on its own substrate because | |
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A. | the enzyme is shaped to fit the substrate |
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B. | the substance searches for its own enzyme |
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C. | there is only ever one type of substrate present |
| 16. | A degradation reaction involves | |
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A. | building up small molecules |
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B. | changing large molecules to small molecules |
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C. | building up large molecules |
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D. | changing small molecules to larger molecules |
| 17. | The substrate for amylase is | |
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A. | fat |
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B. | protein |
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C. | sugar |
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D. | starch |
| 18. | The substrate for phosphorylase is | |
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A. | glucose |
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B. | glucose-1-phosphate |
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C. | phosphate |
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D. | starch |
| 19. | The product of phosphorylase is | |
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A. | glucose |
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B. | glucose-1-phosphate |
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C. | phosphate |
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D. | starch |
| 20. | Which of the following would form starch? | |
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A. | glucose-1-phosphate and catalase |
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B. | glucose and phosphorylase |
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C. | glucose-1-phosphate and phosphorylase |
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D. | glucose-1-phosphate and amylase |
| 21. | A reaction takes place because the active site of an enzyme is complementary to | |
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A. | one type of substrate molecule |
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B. | all types of substrate molecule |
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C. | one type of product molecule |
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D. | all types of product molecules |
