BSC 2010 Lecture Notes - Lecture 3: Cell Membrane, Lipid Bilayer, Phospholipid
Document Summary
The plasma membrane is the boundary that separates the living cell from its surroundings. Phospholipids are the most abundant lipid in the plasma membrane. Proteins will provide the function to the membrane. Phospholipids in the plasma membrane can move within the bilayer. When temperature cools the membrane will solidify and slow down. Flexion: the tales of phospholipids can move. Movements of phospholipids: flexion, diffusion, flip flop, rotation. The membrane solidifies due to the types of phospholipids. The steroid cholesterol has different effects on membrane fluidity at different temperatures (can maintain fluidity) A membrane: is a collage of different proteins, often grouped together embedded in the fluid matrix of the lipid bilayer. Two classification: integral (transmembrane protein) and peripheral (surface protein) Determine most of membranes specific functions: transport, enzymatic activity, signal transduction, cell-cell recognition, intercellular joining, attachment to cytoskeleton and extracellular matrix (ecm)
