Question

which component is released from the active site of an enzyme during a chemical reaction?
reactant
product
substrate
protein

Explanation:

Enzymes are biological catalysts. The substrate binds to the active site of the enzyme. After the chemical reaction (catalyzed by the enzyme), the product is formed and released from the active site. Reactants are the starting substances (substrate is a type of reactant in the context of enzyme - catalyzed reactions). Proteins are the general class to which many enzymes belong (but not the component released from the active site).

Answer:

product