Answer:
where there are two different enzymes used to reverse a specific step in a metabolic pathway is the correct answer.
Step-by-step explanation:
where there are two different enzymes used to reverse a specific step in a metabolic pathway is a process of substrate cycling because its a process that happen between two metabolic pathways or different enzymes ,non equilibrium catalyses reactions which occurs or happen at the same time in opposite directions and having no effect but its deplete energy inform of heat.