01:119:115 Lecture Notes - Lecture 7: Facilitated Diffusion, Lipid Bilayer, Cell Membrane

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: Dr.Christy Beal

Document Summary

Lecture 7 - membranes & transport: structure of cellular membranes. Membrane compentns can move laterally within one layer of the membrane. Chain length of tails & bends in tails. Amount of cholesterol acts as a spacer . Functions of membranes proteins: transport, enzymes, signal transduction. Moves with the gradient (like a bike downhill) Moves against the gradient (bike going uphill) From a low to high concentration: passive transport. Tendency for molecules of a substance to fill available space. Small polar uncharged molecules = including h2o (osmosis) Diffusion of water across selectively permeable membrane. Solvent: a substance capable of dissolving other substances. Water moves towards higher concentration of solute. Ability of a solution to cause a cell to gain or lose water. Solute outside of cell = solute inside of cell. Solute outside of cell > solute inside of cell. Solute outside of cell < solute inside of cell. Transport using transport proteins - integral proteins.