Question

What happens to enzymes after they speed up a biochemical reaction?

Answer 1

Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Then enzymes speed up reactions by lowering activation energy. Many enzymes change shape when substrates bind.

Answer 2

enzymes make reactions go faster (catalyze reactions), but once the reaction is complete the enzyme is just like it was before the reaction.