Answer and Explanation:
The embedded proteins in membrane allow transportation of ions and molecules in and out of the cell. The molecules are trasnported through the flip-flop motion. They also provide area for attachment of enzymes like transferase and hydrolase which are involved in metabolic activities. There are two different types of trasnmembrane proteins that facilitate passage of molecules across the plasma membrane; carrier proteins and channel proteins. The chains that are available on the plasma membrane include active transport that is driven by ATP hydrolysis, facilitated diffusion and ion channels.