Enzymes are biological catalysts that accelerate chemical reactions in living organisms. They work by lowering the activation energy required for a reaction to proceed. Each enzyme is specific to a particular substrate, which is a molecule that the enzyme acts upon. The region of the enzyme where the substrate binds is called the active site. An essential aspect of enzyme function is its ability to form an enzyme-substrate complex, facilitating the conversion of substrate into product. Which statement best describes the role of enzymes in biochemical reactions?