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| Biology 11th Chapter 3 Enzymes Questions Bank |
Biology 1st Year Chapter 3 Enzymes Questions Bank
MCQs
Please select the right answer.
1. A catalyst is a chemical involved in, but not by, a chemical reaction.
2. A certain enzyme will hydrolyze egg white but not starch. Which statement best explains this observation?
3. A student conducts an experiment to test the efficiency of a certain enzyme. Which would probably not result in a change in the enzyme's efficiency?
4. Activation energy:
5. Almost all enzymes are:
6. Amino acids:
7. An enzyme is generally named by adding to the end of the name of the
8. An enzyme that hydrolyzes protein will not act upon starch. This fact is an indication that enzymes are:
9. An enzyme with its coenzyme or prosthetic group, removed is called as:
10. An inhibitor that changes the overall shape and chemistry of an enzyme is known as:
11. An uncatalysed reaction requires a:
12. At high temperature the rate of enzyme action decreases because the increased heat:
13. At about 0°C, most enzymes are:
14. Chemical nature of enzymes is:
15. Competitive inhibitors stop an enzyme from working by:
16. Competitive:
17. Consider this reaction. A + B C + D + energy.
18. DDT and Parathion are inhibitors of key enzymes in:
19. Emil Fischer:
20. Enzyme B requires Zn' in order to catalyze the conversion of substrate X. The zinc is best identified as:
21. Enzymes are highly specific for a given substrate which is due to the shape of their:
22. Enzymes function as:
23. Enzymes:
24. Even traces of enzymes can bring about change in large amount of:
25. Every enzyme functions effectively at:
26. If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products would be:
27. protein part is covalently bonded to the protein part of an enzyme, it is called as:
28. In human body the optimum temperature for enzymatic activities is:
29. In the lock and key model of enzyme action, the part of the enzyme that recognizes the substrate is known as the:
30. Inhibitors:
31. Koshland in 1959 proposed the modified form of:
32. Many enzymes function by the activation energy of reactions.
33. Medium required for Enzymes vigorous activity:
34. Metal ions:
35. Mg' is an inorganic activator for the enzyme:
36. protein components of enzymes are known as:
37. proteinaceous part of holoenzyme is:
38. Optimum pH value for pepsin is:
39. Photosynthesis:
40. Proteinaceous part of holoenzyme is:
41. Salivary amylase:
42. The ""lock and key hypothesis"" attempts to explain the mechanism of:
43. The ""lock and key"" model of enzyme action illustrates that a particular enzyme molecule:
44. The active site of an enzyme is composed of binding site and:
45. The binding of the substrate to the enzyme alters the structure of the enzyme:
46. The catalytic activity of an enzyme is restricted to its small portion called:
47. The catalytic activity of an enzyme is restricted to its small portion called:
48. factor of an enzyme (if it is an inorganic ion) is called as:
49. The enzyme minus its coenzyme is referred to as the:
50. The enzymes are classified into:
51. The enzymes are sensitive to:
52. The enzymes involved in the cellular respiration in eukaryotes are found in:
53. The first step in any reaction catalysed by an enzyme is the formation of a specific association between the molecules called:
54. The function of competitive inhibitors is defined by their ability to interact or bind to:
55. The minimum amount of energy needed for a process to occur is called the:
56. The name enzyme was suggested in 1878 by the German physiologist:
57. The optimum pH value for pancreatic lipase is:
58. The rate of reaction of enzyme directly depends upon:
59. The reaction below occurs within the cells to prevent the accumulation of hydrogen peroxide. In this reaction, catalase functions as an: 2H202 + Catatase à2H2O+ O₂
60. The reversible inhibitors usually constitute:
61. The site where enzyme catalyzed reaction takes place is called:
62. protein organic molecules bound to enzymes near the active site:
63. Vitamins are essential for the survival of organisms because vitamins usually function as:
64. What is a coenzyme?
65. What is a cofactor?
66. When a molecule binds to an area of an enzyme that is not the active site, and changes the shape of the enzyme so that it no longer can work, this is called:
67. When the final product of a metabolic pathway turn off the first step of metabolic pathway it is:
68. When the inhibitory chemical, which does not have to resemble the substrate, binds to the enzyme other than at the active site is called:
69. walls?
70. Which of the following enzymes would digest a fat?
71. Which one inactivates an enzyme by indirectly changing the shape of the active site of an enzyme?
72. Which one is not attribute of enzyme?
73. Which type of inhibitor is shown in this diagram?
74. substrate interaction?
75. Zn+2 is an inorganic activator for enzyme:
Short Questions
1. Define activator?
2. Define active site of enzyme.
3. Define enzyme inhibitors. Give its two types.
4. Define feedback mechanism of enzyme with diagram.
5. Define holoenzyme?
6. Define inhibitors and give an example.
7. Define oprimum pH of enzyme?
8. Define optimum temperature of enzyme?
9. Define prosthatic group and apoenzyme.
10. Define prosthetic group and give example.
11. Differentiate between irreversible and reversible inhibitors?
12. Differentite between apoenzyme and holoenzyme.
13. Diiferentiate between substate and active site of an enzyme.
14. Do mononucleotides work independently as heredity material? Why?
15. Give difference between prosthetic group and activator.
16. How conjugated molecules are formed?
17. How DNA is different from RNA in nucleotides?
18. How do irreversible inhibitors check the reaction rate of enzyme?
19. How does an enzyme and substrate react?
20. How does enzyme concentration affect the rate of enzyme action?
21. How extreme changes in pH affect enzyme?
22. How many essential amino acid are found in the body of living organisms?
23. How many regions are present in active site?
24. Many birds must store large amounts of energy to power flight during migration which type of organic molecules would be the most advantageous for energy storage why?
25. What do you know about lock and key model?
26. What is active site?
27. What is an optimal or optimum value of a factor during reaction?
28. What is Apoenzyme?
29. What is co-enzyme?
30. What is co-factor? Give its types.
31. What is effect of change in pH on working of enzymes?
32. What is induce fit model of enzyme reaction.
33. What is induced fit model?
34. What is inhibitor?
35. What is irreversible inhibitor?
36. What is meant by optimum temperature? Give an example.
37. What is optimum pH? Give one example.
38. What is substrate?
39. What is the optimum temperature for enzynes of human body?
40. What would happen if amount of enzhme is incressed by two fold?
41. Which factor can affect rate of catalysis of enzyme?
42. Who proposed lock and key model?
43. Why butter solidifies at room temperature but not mustered oil?
44. Why carbohydrates are called as hydrated carbons?
45. Why DNA is considered as heredity material?
46. Why enzymes are denatured at high temperature?
47. Why glycolipids are also called as cerebrosides?
48. Why lipids are used to store energy?
49. Why monosaccharide’s are also called as simple sugars?
50. Why phospholipids are most important class are most important class of lipids?
51. Why proteins are called nitrogenous compounds?
52. Why water molecules are considered as amphoteric molecules?
53. Why water requires higher amount of energy to change into vapours or ice?
Long Questions
1. What are enzymes? Give their characteristics.
2. Give the two ideas proposed about the formation of enzyme substrate complex.
3. Define Cofactor, poenzyme, Substrate, Competitive inhibitor.
4. What are inhibitors? How do they effect enzyme? Give their types.
5. What is co-factor? Write its importance
6. Differentiate between apoenzyme and holoenzymes?
7. Compare pepsin with pepsinogen.
8. Write distribution of enzyme in the cell?
9. Write characteristics of enzyme?
10. Differentiate between product and substrate?
11. What is feedback inhibition? Give an example.
12. What is the mechanism of enzyme action?
13. Differentiate between binding and catalytic sites?
14. What is lock and key model?
15. What is induced fit model? Who proposed it?
16. Differentiate between reversible and irreversible inhibitors?