Enzymes are important to metabolic reactions of the cell in which of the following ways?
a. enymes allow reactions that could not normally occur.
b. enzymes lower the activation energy needed for the reaction.
c. enzymes increase the rate (speed) of reaction so that the reaction occurs more quickly
d. both a and b are correct
e. both b and c are correct.

Option (e).

Explanation:

Enzymes may be defined as the biocatalyst that are used during the metabolic reaction of the body. Most of the enzymes are proteinaceous in nature.

The main function of the enzyme is to lowers the activation energy of the reaction. The lowering of the activation energy reduces the energy barrier and substrate can be converted into the product easily. Hence, enzymes also increases the rate of a reaction.

Thus, the correct answer is option (e).

that is wrong, its not thymus.