An enzyme-controlled reaction is often expressed in the following way:

substrate --> product (enzyme above)

The substrate molecules (orange rectangle) diffuse in [from the left] and, as in all hydrolysis reactions, water (represented by the small blue rectangle) participates in the breakdown, with the release of products (red and yellow squares), which diffuse away [to the right]. The process continues as long as there are substrate molecules to be converted, as the enzyme molecule (green) is unchanged at the end of the reaction.
[Animation]

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