Which of the following factors can influence enzyme activity?

1. High temperature

2. pH

3. Substrate concentration

4. All of these

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Which of the following is true for competitive inhibition?

1. Km decreases but Vmax increases

2.  Km increases but Vmax decreases

3.  Km increases but Vmax remains same

4.  Km decreases but Vmax remains same

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What would happen to Km, in presence of a competitive inhibitor?

1. Increase

2. Decrease

3. remains constant

4. First increases then decreases

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What would happen to Vmax, in presence of a competitive inhibitor?

1. Increase

2. Decrease

3. remains constant

4. First increases then decreases

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The substrate of enzyme succinic dehydrogenase is

1. succinate

2. malonate

3. malate

4. mannose

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The competitive inhibitor of enzyme succinic dehydrogenase is

1. succinate

2. malonate

3. malate

4. mannose

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km (Michaelis constant) value of enzyme is the substrate concentration at which velocity of reaction

1. Vmax

2.  one fourth of Vmax

3. One third of Vmax

4. half of Vmax

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Which of the following in not an example of competitive inhibition?

1. Inhibition of succinic dehydrogenase by malonate

2. Inhibition of bacterial pathogens by sulpha drugs

3. Inhibition of alcohol dehydrogenase by ethanol in case of methanol poisoning

4. Inhibition of hexokinase by glucose-6-phosphate

Concept Questions :-

Factors Affecting Enzyme Catalysis Reaction
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Which of the following is true for Non- Competitive Inhibition?

1. It cannot be overcome by increasing the concentration of the substrate

2. Cyanide kills an animal by inhibiting cytochrome oxidase through non competitive inhibition

3. It does not interfere with the binding of the substrate to enzymes

4. All of these

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Which of the following class of enzyme is used for catalysing hydrolysis of ester, ether, peptide bonds?

1. Lyases

2. Ligases

3. Hydrolases

4. Both A and B

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