chap.3 Enzymes
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1. |
Chapter no.3 Enzymes |
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2. |
The
nature of biological catalyst is (a)
Protein (b) Lipid (c)
Carbohydrate (d) Nucleic acid |
A |
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3. |
The
part of enzyme where reaction takes place is
called: (a)
Substrate (b) Coenzyme (c)
Active Site (d) None of
these |
C |
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4. |
How
many reactions are catalyzed by a specific
enzyme? (a)
Only one (b) Two
reactions (c)
Many reactions (d) No reaction |
A |
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5. |
Lock
and key hypothesis was proposed by Fischer
in: (a)
1790 (b) 1890 (c)
1990 (d) 1999 |
B |
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6. |
The
amount of energy required to start a reaction
is called: (a)
Kinetic energy (b) Potential
energy (c)
Activation energy (d) None of these |
C |
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7. |
Co-enzymes
are derived from: (a)
Vitamins (b) Minerals (c)
Both a and b (d) None of these |
C |
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8. |
Cofactor
may be: (a)
Organic (b) Inorganic (c)
Metalic lons (d) All of these |
D |
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9. |
Beriberi
is caused due to the lack of: (a)
Vitamin A (b) Vitamin B (c)
Vitamin C (d) Vitamin K |
B |
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10. |
Which
one of the following is a co-enzyme? (a)
NAD (b) FAD (C)
NADP (d) All of these |
D |
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11. |
Non-protein
organic part of enzyme is called: a)
Co-enzyme (b) Holoenzyme (c)
Prosthetic group (d) All of these |
A |
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12. |
Apoenzyme
is: (a)
Proteins (b)
Carbohydrate (c)
Vitamin (d) Amino acid |
A |
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13. |
a
substance unrelated to the substance that reversible changes the activity of an enzyme by binding at a
site other than active site is known
as: a)
competitive inhibitor (b)
catalytic inhibitor c)
allosteric inhibitor (d)
catalytic inhibitor |
C |
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14. |
Lock
and key o theoy was suggested by a)emilfisher (b) Koshland (c)
Anselme Payen (d) Eduard Buchner |
A |
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15. |
The
optimum pH for urease is: (a)
15-16 (b) 2 (c)4.5 (d) 7 |
D |
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16. |
All
enzymes are proteins except: (a)
Ribozyme (b) Lysozyme (c)
Both of these (d) None of these |
A |
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17. |
Lock
and key model was rejected by: (a)
E. Fischer (b) D. Koshland (c)
Fedrick (d) R. Mortin |
B |
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18. |
The
structure of enzyme must go a slightly change is the statement of: (a)
Key- Lock Model (b)
Hand-Gloves Model (c)
Induced --Fit Model (d)
Both b and c |
D |
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19. |
(2H
O 2H,O+ O:) For the given reaction activation
energy is 86 kJ/mol with no catalyst.What will be the Ex required if same
reaction is performed in presence of enzyme? (c)
86 kJ/mol (b) 8.6kJ/mol (c)
None of these (d) Ikg/mol |
D |
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20. |
Vitamin
B acts as co-enzymes. What will happen if Vitamin B is reduced / missing in a
body? (a)
No-effect (b)
Metabolism is effected (c)
Beri-beri is produced (d)
Both b and c |
C |
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21. |
Peptidase
and esterase both belong to: (a)
Hydrolase (b) Isomerase (c)
Transferase (d)
Both a and b |
A |
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22. |
The
optimum temperature for snow flea is: (a)
37°C (b) 0°C (c)
10°C d. -100C |
D |
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23. |
What
will happen to enzyme activity, if temperature becomes 0°C: (a)
Activity will be zero (b)
Minimum (c)
No effect (d)
Enzyme will be denatured |
B |
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24. |
What
is physiological pH for most of enzymes: (a)
7-8 (b) 1 - 3 (C)
5-7 (d) 1 - 14 |
A |
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25. |
Which
of the following acts as non- competitive inhibitors: (a)
Cyanides (b) Heavy-metal
ions c)Insecticides
(d) All of these |
D |
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26. |
The
non-competitive inhibitors binds with: (a)
Active of enzyme (b) Receptor site (c)
Allosteric site (d) Both b and
e |
D |
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27. |
The
optimum pH value for pepsin to work in is: (a)
6.8 (b) 5.5 (c)
4.5 (d) 2 |
D |
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28. |
The
enzyme of the arctic snow flea works at: (a)
60°C (b) 30°C (c)
40°C (d)-10°C |
D |
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29. |
Which
of the following factors does not affect the rate of enzyme action: (a)
Enzyme concentration (b)
Light intensity (c)
Substrate concentration (d)
Temperature |
B |
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30. |
The
suffix which is added to substance to name of an enzyme: (a)
lce (b) Ace (c)
Ise (d) Ase |
D |
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31. |
The
enzyme decarboxylase, deaminases and synthases
are examples of: (a)
Hydrolase (b) Lyases (c)
Ligases (d) Isomerases |
b |
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32. |
All
enzymes are protein except: (a)
Ribozyme (b) Lysozyme (c)
Both of these (d) None of these |
A |
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33. |
The
structure of enzyme must go a slightly change is the statement of: (a)
Key-lock Model (b) Hand-gloves Model (c)
Induced -fit Model (d) Both b and c |
C |
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34. |
Peptidase
and esterase both belong to: (a)
Hydrolase (b) Isomerase (c)
Transferase (d)
Both a and b |
A |
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35. |
At very high temperature enzyme loses its catalytic
activity due to: (a)
Loss of active site (b)
Denaturation (c)
Prosthetic (d)
Saturation with substrate. |
B |
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36. |
Study
about enzyme is called: (a)
Mycology (b) Phycology (c)
Enzymology (d)
Ornithology |
C |
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37. |
The
example of oxidoreductase are: (a)
Oxidase (b) Peroxidase (c)
Oxygenase (d) All of these |
D |
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38. |
________catalyze
bond formation between two substrate molecules. (a)
Isomerase (b) Hydrolase (c)
Ligase (d) Lyases |
C |
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39. |
What
is the pH of urease and catalase? (a)
8 (b)
6.1-6.8 (c)
7 (d) 4-5 |
C |
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40. |
The
example of competitive inhibitor is: (a) Cyanide (b)
Heavy Metals (c)
Insecticides (d)
Sulphonamide |
D |
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41. |
Co-enzymes
are attached to enzymes by bond. (a)
Covalent bond (b)
Ionic bond (c)
Coordinate covalent bond (d)
Weak bond |
D |
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42. |
What
are the characteristics of enzymes? (a)
Protein in nature except ribozymes (Ribosome) (b)
Do not alter the equilibrium of a reaction (c)
Globular in nature and lower the activation energy (d)
All of these |
D |
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43. |
As
the enzyme concentration increases the rate of the reaction linearly. (a)
Decreases (b) Increases (c)
Does not affect rate (d) None
of these |
B |
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44. |
Sometimes
enzymes and substrate are held together by the kind of bonds called: (a)
Ionic (b) Hydrogen (c)
Hydrophobic (d) Covalent. |
D |
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