Class 9th Biology Chapter 6 Enzymes

biology 9th notes Chapter No 6

1. The molecules formed after the action of enzymes:


2. Enzyme lipase acts on lipids and convert them into:


3. Which of the following organelles are bounded by cell membranes?


4. Who first used the term Enzyme ?


5. Who proposed the induced fit model of enzyme action


6. Enzymes working in body cavities are:


7. Enzymes do not:


8. Induced fit model was proposed by:


9. The term metabolism is derived from which language?


10. Enzymes used for the removal of protein stains from clothes are:


11. Enzymes _________ the activation energy.


12. All enzymes are made up of linear chains of:


13. Enzyme used for the removal of protein stains from clothes is:


14. Non protein molecules or ions required by some enzymes are called:


15. It recognizes and binds substrate and then carries out reaction.


16. Enzymes act as ___________ and speed up and regulate metabolic pathways.


17. Some important vitamins (e.g. riboflavin, thiamine and folic acid) act as:


18. Lock and key hypothesis was proposed in:


19. If organic cofactors are loosely attached to enzymes, they are called:


20. According to this model active site has a specific shape:


21. Enzyme substrate complex (ES) is formed when enzyme attaches with:


22. Those molecules on which enzymes effect:


23. Which of these biocatalysts are proteins?


24. Lock and Key model was prepared in:


25. Enzyme lipase acts only on:


26. Enzymes used in biological detergents:


27. An Enzyme which breaks down Starch is:


28. Enzymes are proteins:


29. Temperature for the maximum working speed of human enzyme is:


30. Induced fit model was proposed in:


31. If organic cofactors are tightly bound to enzymes, they are called:


32. When was induced fit model presented?


33. Lock and key hypothesis was proposed by:


34. To what category of molecules do enzymes belong?


35. When enzyme substrate complex (ES) breaks enzyme and __________ are released.


36. Starch is broken down by an enzyme called:


37. Enzyme used for cleaning utensils is


38. The molecules at which enzymes act are called:


39. Metabolism is derived from Greek word meaning:


40. German physiologist Winhelm Kuhne used the term enzymes in:


41. In the presence of enzymes reaction proceed at:


42. Enzymes working in the cytoplasm:


43. The part of enzymes directly involved in catalysis:


44. According to this model active site is not a rigid structure:


45. Enzymes are made up of:


46. Lock and Key Model of Enzyme Action was proposed by:


47. Lipase enzyme act on only:


48. Trypsin enzyme works in


49. In metabolism works as catalyst


50. Enzymes used in dish washing to remove resistant starch residues are: (DGK-G2) 2013


51. Enzymes are actually composed of:


Short Questions

1. Are all biochemical catalysts proteins?
2. Birds have higher body temperature than mammals. What would happen to the activity of a bird’s enzyme if it is given temperature of 37°C?
3. Define Activation energy. Write its role in enzyme action.
4. Define Anabolism.
5. Define Biocatalysts.
6. Define Catabolism.
7. Define Co-enzymes. Write their function.
8. Define Co-factors.
9. Define Enzymes.
10. Define Metabolism. Who gave the concept of metabolism?
11. Define photosynthesis.
12. Define protease.
13. Define redox reactions. Why are they important?
14. Describe any two uses of enzymes.
15. Describe Induced Fit model. /Induced Fit model is more acceptable than Lock and Key model of enzyme action. Explain.
16. Describe Lock and Key model.
17. Describe the process of osmosis.
18. Describe the use of enzyme in food and Brewing industry.
19. Describe two properties of enzymes.
20. Differentiate between aerobic and anaerobic respiration
21. Differentiate between anabolism and catabolism.
22. Differentiate between intra-cellular and extra-cellular enzymes.
23. Differentiate between oxidation and reduction.
24. Give function of lipase.
25. Give its types.
26. Give the mechanism of enzyme action.
27. How do enzymes create metabolic pathways?
28. How do enzymes lower the activation energy?
29. How does temperature affect the rate of enzyme action?
30. How enzymes are used as biological detergents?
31. Name industries where enzymes are used.
32. Name only factors affecting the rate of enzyme action.
33. On what substrate does Amylase act?
34. What are Substrates?
35. What are the subunits of ATP?
36. What do you know about the substrate and product of the reaction?
37. What do you mean by saturation of active sites?
38. What do you mean by specificity of enzymes?
39. What do you understand by ATP?
40. What events take place during dark reactions?
41. What events take place during light reactions?
42. What is Calvin cycle?
43. What is cellular respiration?
44. What is denaturation of an enzyme?
45. What is Enzyme Substrate Complex?
46. What is meant by active site?
47. What is meant by enzyme active site? Write its role in enzyme activity.
48. What is optimum pH?
49. What is Optimum Temperature? What is optimum temperature for human enzymes?
50. What is photolysis?
51. What is Prosthetic Group?
52. What is the effect of pH on rate of enzyme action?
53. What is the main use of enzymes in paper industry?
54. Who first used the term enzyme?
55. Write down the simple general equation for photosynthesis.


Long Questions

1. Briefly describe the factors that affect the activity of enzymes.
2. Define enzyme. Explain the mechanism of enzyme action.
3. Define metabolism, anabolism and catabolism.
4. Describe in detail the factors that affect the rate of enzyme action.
5. Describe lock and key model of enzyme action.
6. Describe mechanism of enzyme action.
7. Describe the characteristics of enzymes.
8. Describe the effect of temperature and pH on the rate of enzyme action.
9. Describe the lock and key mechanism of enzyme action.
10. Describe the uses of enzymes.
11. Explain induced fit model
12. Explain specificity of enzymes.
13. How do you relate enzymes with metabolism? Also describe activation Energy.
14. How does pH affect enzyme activity?
15. How would you define enzymes? Describe their characteristics.
16. In a range of 0-35°C, the rate of reaction of an enzyme is proportional to temperature. Above 35°C and below 0°C, enzyme activity slows down and eventually stops. Explain why?
17. What are enzymes? Write any five characteristics. 
18. What are the effects of substrate concentration on the rate of enzyme action?
19. What characteristic of enzymes makes them specific for substrates?
20. What do you mean by activation energy and why it is referred in the definition of enzymes?
21. What is an enzyme. Give its different uses.
22. What is meant by specificity of enzyme action? Explain
23. Which factors effect on the rate of enzyme action?
24. Write properties of Biocatalysts.

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