LIFE 102 Lecture Notes - Lecture 13: Fluid Mosaic Model, Lipid Bilayer, Passive Transport
Document Summary
States that a membrane is a fluid structure with a mosaic of various proteins embedded in it. A specialized preparation technique that splits a membrane along the middle of the phospholipid bilayer. *as temperature cools, membranes switch from fluid to solid. The temperature (solid point) depends on the type of lipid. *membranes rich in unsaturated fatty acids are more fluid than those rich in saturated fatty acids. Has different effects on membrane fluidity at different temperatures. At warm temperatures, cholesterol restrains movement of phospholipids. A collage of different proteins embedded in the fluid matrix of the lipid bilayer. Hydrophobic (nonpolar) molecules (e. g. hydrocarbons), can dissolve in lipid bilayer and pass through the membrane rapidly. Polar molecules do not cross the membrane easily. Allow passage of hydrophilic substances across the membrane. Have a hydrophilic channel so that certain molecules or ions can use a tunnel. Bind to specific molecules and change shape to shuttle them across the membrane.
