MCAT (Medical College Admission Test) Question:
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Which one of the following general characteristics is shared by all catalysts?


1. They induce more collisions among reactant molecules.
2. They transfer kinetic energy to the reactant molecules.
3. They increase the reaction rate but do not change the Keq of a reversible reaction.
4. They increase both the reaction rate and the Keq of a reversible reaction.

Answer: C

Explanation: In general, catalysts lower the activation energy of the slowest step in a reaction. Thus, they increase the rate of the reaction without increasing the number of collisions, the kinetic energy of the reactants, or the Keq of a reversible reaction. Thus, answer choice C is the best answer.

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