Inhibition of succinate dehydrogenase by malonate is an example of:

1. Non-competitive inhibition

2. Competitive inhibition

3. Antagonism

4. Synergism

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 92%
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The Km value of an enzyme denotes the substrate concentration at which the enzyme catalyzed reaction:

1. Reaches Vmax

2. Shows a decline in the rate of reaction

3. Attains ½ Vmax

4. Finally stops

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 82%
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The Km value of an enzyme denotes the substrate concentration at which the enzyme catalyzed reaction:

1.  Reaches Vmax

2.  Shows decline in the rate of reaction

3.  Attains ½ Vmax

4.  Finally stops

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 91%
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The rate of enzyme action decreases at higher temperature [after a certain value] because the increased heat

(1) changes the pH of the system

(2) alters the active site of the enzyme

(3) neutralizes the acids and bases in the system

(4) increases the concentration of the enzyme

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 78%
From NCERT
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Which of the following does not affect the activity of simple enzyme?

1. Temperature

2. Presence of coenzymes

3. pH

4. Substarate concentration

 

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 72%
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The following graphs show enzymatic activity for certain factors on x-axis and y-axis. Which of the following is correct in such regard?

1. Figure (1) ; x-axis - Potential energy , y-axis- Progress of reaction

2. Figure (2) ; x-axis - Enzymatic activity, y-axis- Temperature

3. Figure (3) ; x-axis- Velocity of reaction, y-axis-Substrate concentration

4. Figure (2) ; x-axis- pH, y-axis- Enzymatic activity                                                 

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
 55%
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  • Look at the graph given below. The reaction rate the reaction can be increased beyond point C by:

 

 

1. increasing the amount of substrate

2. adding more water

3. increasing the temperature

4. decreasing enzyme concentration

Subtopic:  Factors Affecting Enzyme Catalysis Reaction |
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How many statements are false from given
information?
(a) Ribozymes are enzyme made up of protein.

(b) In every chemical reaction transition state
energy is always greater than activation energy.

(c) Co-factors are always proteinous in nature

(d) Enzyme inhibition can not be removed.

(e) Enzyme action can be stopped at low temp.

(f) Km value (Michaelis constant) is the specific
concentration of substrate molecule.

1. 2 

2. 3

3. 4 

4. 5

Subtopic:  Enzymes | Factors Affecting Enzyme Catalysis Reaction |
 50%
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