Vacuoles have the simple structure of a sac, a single membrane surrounding solid or liquid contents. There are a wide variety of vacuoles, containing a wide variety of substances.
Many plant cells contain a large central vacuole filled with water.
The structure of vacuoles is very simple. They consist of a single membrane surrounding the liquid or solid contents. The vacuole acts a container. A food vacuole in a single celled amoeba contains the food item that the amoeba has consumed. The central vacuole of a plant cell contains water and substances such as amino acids, sugars and other compounds tat the plant needs.