Question

enzymes
a decrease the rate and the δg of a reaction.
b only increase the rate of the reaction.
c increase the rate and the δg of a reaction.
d decrease the δg of a reaction.
e increase the δg of a reaction

Explanation:

Enzymes are biological catalysts. Catalysts increase the rate of a chemical reaction by lowering the activation - energy. They do not affect the Gibbs free - energy change ($\Delta G$) of a reaction. $\Delta G$ is determined by the nature of the reactants and products and is independent of the reaction pathway. So, enzymes only increase the rate of the reaction.

Answer:

B. only increase the rate of the reaction.