A<unk>  is a spherical vesicle composed of a bilayer membrane.  In biology, this specifically refers to a membrane composed of a phospholipid and cholesterol bilayer (see on the right).<unk> s can be composed of naturally-derived phospholipids with mixed lipid chains (like egg phosphatidylethanolamine), or of pure surfactant components like DOPE (dioleoylphosphatidylethanolamine).<unk> s, usually but not by definition, contain a core of aqueous solution; lipid spheres that contain no aqueous material are called micelles, however, reverse micelles  can be made to encompass an aqueous environment.
Liposome
Electron shell
Nucleic acid
Capsid
Phospholipid
Glycolipid
Macrocycle
Ovacome