A model of the plasma membrane; "mosaic" because of the range of substances that make it up.
It consists of a phospholipid bilayer reinforced by cholesterol molecules, integral and peripheral proteins and carbohydrate molecules.
What is the structure of the lipid bilayer?
The lipid bilayer contains two laters of phospholipids back to back, forming a flexible membrane. Because one end is hydrophilic and the other hydrophobic, the hydrophilic ends will naturally orient themselves towards water and the hydrophobic ends will naturally orient themselves away.
What are integral proteins?
Proteins that are embedded in, or all the way through the lipid bilayer. They have many roles such as ion channels, carrier proteins, receptors, enzymes and cell markers.
What are peripheral proteins?
Proteins that attach temporarily, whether to the lipid bilayer or an integral protein. They have a role in cell signalling, vesicle trafficking, forming blood clots (some are also enzymes).
What are glycoproteins?
Glycoproteins are proteins with glycans molecules attached on polypeptide side chains.. They are a mixture of proteins and carbohydrates. They have a role in cell recognition.
What are some examples of membrane protein functions?
Transportation of molecules through cells, cell recognition, structure, receptors and enzymatic function.