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).

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.