When an enzyme catalyzes a reaction,
A. it lowers the activation energy of the reaction.
B. it raises the activation energy of the reaction.
C. it acts as a reactant.
D. it is used once and discarded.
Answer:A
When an enzyme catalyzes a reaction,
A. it lowers the activation energy of the reaction. B. it raises the activation energy of the reaction. C. it acts as a reactant. D. it is used once and discarded.