Rate of a Reaction

Q. Select the correct option:

1. lowering
2. increasing
3. unaltering
4. either (a) or (b)

Q. Which among the following is the incorrect statement about enzymes?

1. Carbonic anhydrase is one of the fastest known enzymes.
2. All enzymes except ribozymes are proteins but all proteins are not enzymes.
3. Enzymes lower the activation energy necessary to transform a reactant into a product.
4. Enzymes accelerate the rate of reaction by undergoing changes in themselves.

Q. In biochemical reactions, the enzymes act by

1. By decreasing the energy of the reactants
2. By increasing the activation energy of the reaction
3. By decreasing the activation energy of the reaction
4. By increasing the energy of the products of the reaction
5. By decreasing the energy of the products of the reaction

Q. Which of the following describes the given graph correctly?

1. Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme
2. Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme
3. Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme
4. Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme

Q. Fill in the blanks.
$C_6{H}_{12}{O}_6\to$ $..........+{2CO}_2+2ATP.$

Q. An enzyme acts by

1. Reducing the energy of activation.
2. Increasing the energy of activation.
3. Decreasing the pH.
4. Increasing the pH.