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To catalyze a biochemical reaction, an enzyme typically
(A) drives the reaction to completion by consuming byproducts of the reaction
(B) binds temporarily to reactant molecules to lower the activation energy of the reaction
(C) dissociates into additional reactant molecules, thereby increasing the reaction rate
(D) decomposes and releases energy to increase the number of successful collisions between reactant molecules

    Solution:
    An enzyme is a biological catalyst. A catalyst is a substance that speeds up the reaction by lowering the activation energy. Choice B is the correct answer choice.

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