Cholesterol; to stabilise the bilayer as it would be too fluid without it.
Glycoproteins; to act as receptors(I think)
Integral Proteins: ion pores(to transport ions) or transport proteins(to carry glucose and amino acids)
(Original post by G O D I V A)
Membranes are made up of a phospholipid bilayer. What is the use/function of:
integral proteins embedded in the phospholipid bilayer
I'm revising for an exam in 2 days so please help
I'll help myself helping you by doing this Interview tomorrow in Cambridge - might come up:
Cholesterol does maintain membrane fluidity - it increases fluidity at lower temperature, and vice versa at higher temperatures. The mechanism is that it acts as a wedge to seperate the phospholipid a little, thereby reducing Van Der Waals bonding and also increasing permeability to molecules.
Glycoprotein acts as cell recognition proteins - "self and non self" really.
Integral proteins -
Carrier proteins - actively transport molecules across the membrane against a concentration gradient (e.g. Na - K pump).
Protein Channels - provides a hydrophilic channel through which water solutes can diffuse through, though the protein is specific [question to others: am I right in saying this is facilitated diffusion?]
Protein Receptors - a ligand attaches to the substrate of the protein on one end, and the other end sends a cascade signal inside the cell, expressing or inhibiting a certain gene from T&T a protein.
Cell Adhesion - certainly some attach to the cytoskeleton inside the cell, and attach to other cell membranes.