Answer: the vacuole
Step-by-step explanation:
These are organelles surrounded by phospholipid membranes within eukaryotes. Proteins may function as a unit called an organelle in different types of cells. Many organelles are enveloped by membranes similar to those forming exterior surface of the cell, with various concentrations of phospholipids and proteins.
Vacuoles are structurally important, they support the cell membrane through exerting turgor pressure. Also, some store nutrients, water and special enzymes concentrated within vacuoles where they can be kept separate from the contents of the cytoplasm.