同©大学 Tongji University Biological Membranes (Cell Membranes) Each cell is separated from its carbobydrate carbohydrate group of protein oyrateoufid surroundings by a membrane. group of peripheral glycoprotein protein extracellular face The cell membrane consists -phospholipid primarily of a thin layer of amphipathic phospholipids. amino acid chain carbohydrate The membrane is embedded unit cytoplasmie face with numerous complex protein structures that act as gateways, controlling the transport of t女ansmembrane proteins molecular species.Tongji University Biological Membranes (Cell Membranes)  Each cell is separated from its surroundings by a membrane.  The cell membrane consists primarily of a thin layer of amphipathic phospholipids.  The membrane is embedded with numerous complex protein structures that act as gateways, controlling the transport of molecular species