Which of the following statements in incorrect w.r.t inorganic catalysts?
1. They do not occur in living cells
2. They are not specific for any reaction
3. They get damaged at high temperature
4. They work efficiently at high temperature
Subtopic: Â Enzymes |
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Enzymes catalyse biochemical reactions by
1. Lowering the activation energy
2. Increasing the activation energy
3. Establishing stable bonds with substrate
4. Increasing temperature
1. Lowering the activation energy
2. Increasing the activation energy
3. Establishing stable bonds with substrate
4. Increasing temperature
Subtopic: Â Enzymes |
 80%
From NCERT
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Read the following :
a. Low temperature preserves the enzyme
b. Enzyme activity increases above optimum temperature
c. Enzyme gets denatured at high temperature
d. Competitive inhibitor competes with the product formed
Which of the following statements are true?
1. (a) & (c)
2. (b) & (d)
3. (c) & (d)
4. (a) & (b)
a. Low temperature preserves the enzyme
b. Enzyme activity increases above optimum temperature
c. Enzyme gets denatured at high temperature
d. Competitive inhibitor competes with the product formed
Which of the following statements are true?
1. (a) & (c)
2. (b) & (d)
3. (c) & (d)
4. (a) & (b)
Subtopic: Â Factors Affecting Enzyme Catalysis Reaction |
 77%
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Enzymes catalysing the breakdown of larger molecules into smaller molecules are
1. Hydrolases
2. Isomerases
3. Ligase
4. Both (1) & (3)
1. Hydrolases
2. Isomerases
3. Ligase
4. Both (1) & (3)
Subtopic: Â Enzymes Classification |
 70%
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Michaelis constant (Km) value of enzyme is substrate concentration at which velocity of reaction is
1. Vmax
2. One third Vmax
3. Half Vmax
4. One fifth Vmax
1. Vmax
2. One third Vmax
3. Half Vmax
4. One fifth Vmax
Subtopic: Â Factors Affecting Enzyme Catalysis Reaction |
 80%
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Study the following statements :
a. The substrate binds to the active site of the enzyme.
b. Enzymes isolated form thermophilic organisms get denatured at 50o C.
c. The active site of enzyme breaks the chemical bonds of the product.
d. Prosthetic groups are tightly bound to the apoenzyme.
Select the option which includes all correct statements :
1. (a) & (c)
2. (c) & (d)
3. (b) & (c)
4. (a) & (d)
a. The substrate binds to the active site of the enzyme.
b. Enzymes isolated form thermophilic organisms get denatured at 50o C.
c. The active site of enzyme breaks the chemical bonds of the product.
d. Prosthetic groups are tightly bound to the apoenzyme.
Select the option which includes all correct statements :
1. (a) & (c)
2. (c) & (d)
3. (b) & (c)
4. (a) & (d)
Subtopic: Â Enzyme Cofactors |Â Mechanism of Enzymes |
 75%
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All enzymes are proteins except
1. Trypsin
2. Pepsin
3. Steapsin
4. Ribozyme and Ribonuclease-P
1. Trypsin
2. Pepsin
3. Steapsin
4. Ribozyme and Ribonuclease-P
Subtopic: Â Enzymes |
 87%
From NCERT
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Cyanide kills an animal by
1. Killing the brain cells
2. Competitive inhibitor of enzyme cytochrome oxidise
3. Inhibiting cytochrome oxidase, a mitochodrial enzyme essential foe cellular respiration by Non-competitive inhibition
1. Killing the brain cells
2. Competitive inhibitor of enzyme cytochrome oxidise
3. Inhibiting cytochrome oxidase, a mitochodrial enzyme essential foe cellular respiration by Non-competitive inhibition
Subtopic: Â Enzyme Inhibition |
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Electron transferring enzymes belong to
1. Transferases
2. Oxidoreductases
3. Lyases
4. Isomerases
1. Transferases
2. Oxidoreductases
3. Lyases
4. Isomerases
Subtopic: Â Enzymes Classification |
 69%
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Enzymes are different from inorganic catalysts in
1. Not being used up in reactions
2. Being proteinaceous in nature
3. Having a high diffusion rate
4. Working at high temperature
1. Not being used up in reactions
2. Being proteinaceous in nature
3. Having a high diffusion rate
4. Working at high temperature
Subtopic: Â Enzymes |
 52%
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