Which of the following is correct?

1.Physical change refers to change in shape without breaking the bonds

2.Change in state of matter also takes place in physical change

3.Chemical change involves breaking of old bonds and formation of new ones.

4.All of these

Subtopic:  Properties of Enzymes |
 96%
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Which of the following is true?

1.Inorganic catalyst work efficiently at high temperatures and high pressures

2.Generally, enzymes get damaged at high temperatures

3.Thermostable enzymes retain their catalytic power even at high temperatures.

4.All of these

Subtopic:  Properties of Enzymes |
 96%
From NCERT
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Which of the following is true?

1. Inorganic catalyst work efficiently at high temperatures and high pressures
2. Generally, enzymes get damaged at high temperatures
3. Thermostable enzymes retain their catalytic power even at high temperatures.
4. All of these
Subtopic:  Properties of Enzymes |
 96%
From NCERT
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Which of the following is incorrect?

1. Enzymatic activity is maximum at its optimim pH and temperature.

2. Enzymatic activity declines both below and above the optimum value.

3. Low temperatures destroys enzymatic activity

4. High temperatures destroys enzymatic activity

Subtopic:  Properties of Enzymes |
 86%
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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

Subtopic:  Properties of Enzymes |
 91%
From NCERT
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Which one of the graphs shows the effect of pH on the velocity of a typical enzymatic reaction (V)?

1.     2.     3.      4.

Subtopic:  Properties of Enzymes |
 88%
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Which one of the graphs show the effect of temperature on the velocity of a typical enzymatic reaction?

Subtopic:  Properties of Enzymes |
 88%
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Mark the Incorrect statement 

1. Co-enzymes are also organic compounds but their association with apoenzyme is only transient

2. Vmax (maximum velocity) represent that there are no substrate molecules to bind with free enzyme molecule

3. Living state is non-equilibrium steady state to be able to perform work 

4. Enzymes eventually bring down the energy barrier making the transition of substrate to product more easy 

Subtopic:  Enzymes | Properties of Enzymes |
 69%
From NCERT
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The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration) what do the two axis (X and Y) represent? 

        
   

X-axis

Y-axis

(a)

Temperature

Enzyme activity

(b)

Substrate concentration

Enzyme activity

(c)

Enzyme activity

Temperature

(d)

Enzyme activity

pH

1.  (a)
2.  (b)
3.  (c)
4.  (d)

Subtopic:  Properties of Enzymes |
 71%
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AIPMT - 2011
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Enzymes work at optimum temperature. Over a range of 0 to 400C, what would happen to the rate of enzyme controlled reactions for every 100C rise in temperature?

1. The rate doubles itself

2. Decreases by half

3. No effect

4. First increases then decreases

Subtopic:  Properties of Enzymes |
 69%
From NCERT
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