How the presence of an enzyme affects the activation energy of a reaction?

In the presence of an enzyme, the activation energy of a reaction

An enzyme catalyses a reaction by activation energy of the reaction .

An enzyme catalyses a reaction by activation energy of the reaction .

How many of the following statements are correct regarding properties of enzyme ? (i) It lowers down the activation energy of the reaction . (ii) An active site of the enzyme is the pocket into which the substate fits . (iii) The catalytic structure of most of the enzyme is globular and primary . (iv) Carbonic anhydrase enzyme is considered as the fastest enzyme.

How many of the following statements are correct regarding properties of enzyme ? (i) It lowers down the activation energy of the reaction . (ii) An active site of the enzyme is the pocket into which the substate fits . (iii) The catalytic structure of most of the enzyme is globular and primary . (iv) Carbonic anhydrase enzyme is considered as the fastest enzyme.

How is rate constant of a reaction affected by temperature ? Write the name of this relation. How will you calculate activation energy of a reaction with the help of this relation ?