Enzymes make ______ into products

• A. Water
• B. Substrates (correct)
• C. Ions
• D. Lipids

Answer: (B)

Enzymes catalyze chemical changes by turning substrates into products. The substrate is the molecule that the enzyme acts on. When it binds at the enzyme’s active site, an enzyme–substrate complex forms, the chemical reaction proceeds, and the substrate is converted into one or more products, which are then released. This transformation is specific: each enzyme binds particular substrates and produces specific products. So, the general role of enzymes is to take substrates and convert them into products, not to originate water, ions, or lipids as a default outcome of their action.