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

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

Which of the following is true?

Which of the following is incorrect?

1. Enzymatic activity is maximum at its optimim p^H 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

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

1. V_max

2.  one fourth of V_max

3. One third of V_max

4. half of V_max

Which one of the graphs shows the effect of pH on the velocity of a typical enzymatic reaction (V)?

1.     2.     3.      4.

Which one of the graphs show the effect of temperature on the velocity of a typical enzymatic reaction?

Mark the Incorrect statement 

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

2. ${V_{max}}_{}$ (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 

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

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