"describe the equilibrium state of a reversible enzyme-catalyzed chemical reaction"

Answer is: the amount of substance of reactants and products of reaction do not change when chemical reaction is in chemical equilibrium.
In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which not change with time. Speed of direct and irreversible chemical reaction are equal.

Ithink 2 is the correct

Answerhave membrane-bound organelles;