How does the formation of the enzyme-substrate complex explain the reduction of the activation energy of chemical reactions?

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How does the formation of the enzyme-substrate complex explain the reduction of the activation energy of chemical reactions?

The enzyme possibly works as a test tube within which reagents meet to form products. With the facilitation of the meeting provided by enzymes it is easier for collisions between reagents to occur and thus the activation energy of the chemical reaction is reduced. This is one of the possible hypotheses.

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