A. enzymes form complexes with their substrates. B. enzymes lower the activation energy for chemical reactions. C. enzymes change the K eq for chemical reactions. D. many enzymes change shape slightly when substrate binds. Features of Enzyme Catalyzed Reactions Enzymes are biological catalysts.
Catalysts lower the activation energy for reactions.
The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy. Many enzymes change shape when substrates bind. Enzymes have active sites. The enzyme active site is the location on the enzyme surface where substrates bind, and where the chemical reaction catalyzed by the enzyme occurs.