Final answer:
Liposomes are synthetic vesicles used to deliver chemicals to cells, separate from natural cellular structures like the endoplasmic reticulum, Golgi apparatus, and lysosomes.
Step-by-step explanation:
The structures that are composed of aqueous compartments enclosed by a lipid bilayer and can be used to deliver chemicals to cells are vesicles, specifically termed as liposomes when created synthetically in the laboratory. The endomembrane system, which includes the endoplasmic reticulum, Golgi apparatus, and lysosomes, is associated with the natural creation and utilization of vesicles within the cell for various functions such as the modification, packaging, and transport of lipids and proteins. However, the actual answer to the student's question lies outside of these organelles and refers to liposomes, a synthetic mimic with drug delivery potential.