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)
Subtopic: Â Enzyme Cofactors |Â Mechanism of Enzymes |
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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%
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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 |
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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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What structural level enables the monomeric proteins to function as enzymes?
1. Primary level
2. Secondary level
3. Tertiary level
4. Quaternary level
1. Primary level
2. Secondary level
3. Tertiary level
4. Quaternary level
Subtopic: Â Proteins |
 67%
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A specific low molecular weight substance such as the product of another enzyme in the chain reaction which binds with a specific binding site is called
1. Competitive inhibitor
2. Non-competitive inhibitor
3. Irreversible inhibitor
4. Allosteric modulator
1. Competitive inhibitor
2. Non-competitive inhibitor
3. Irreversible inhibitor
4. Allosteric modulator
Subtopic: Â Enzyme Inhibition |
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The term feedback refers to
1. The effect of substrate on the rate of enzyme action
2. The effect of end products on the rate of enzymatic action
3. The effect of enzyme concentration on its rate of action
4. the effect of an external compound on the rate of enzymatic action
1. The effect of substrate on the rate of enzyme action
2. The effect of end products on the rate of enzymatic action
3. The effect of enzyme concentration on its rate of action
4. the effect of an external compound on the rate of enzymatic action
Subtopic: Â Enzyme Catalysis |
 63%
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Which of the following is the best evidence for the lock and key theory of enzyme action ?
1. All isolated enzymes have been identified as protein
2. compounds similar in structure to the substrate inhibit the reaction
3. Enzymes are found in living organisms and speed up certain reaction
4. Enzymes determine the direction of a reaction
1. All isolated enzymes have been identified as protein
2. compounds similar in structure to the substrate inhibit the reaction
3. Enzymes are found in living organisms and speed up certain reaction
4. Enzymes determine the direction of a reaction
Subtopic: Â Enzyme Inhibition |
 68%
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Co-enzyme is
1. Always a protein
2. Often a metal
3. Always an inorganic compound
4. Often a vitamin
1. Always a protein
2. Often a metal
3. Always an inorganic compound
4. Often a vitamin
Subtopic: Â Enzyme Cofactors |
 58%
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