In an enzyme-substrate complex, what is the difference between a substrate and a product?

• A. The substrate binds and is converted to the product; the product is released.
• B. The substrate is the molecule that binds and undergoes a chemical change; the product is the molecule formed after the reaction and released.
• C. The substrate binds but does not react; the product is formed elsewhere.
• D. The substrate and product are the same molecule in different conformations.

Answer: (B)