Unformatted text preview: D. Methods for getting across = transport 1. passive: no energy needed, things move along their concentration gradient a. diffusion: concentration gradient b. Osmosis: diffusion of H2O only-Osmotic concentration: solutions made up of 2 parts: water and solutes-If a solution contains more solutes than water, it is a hypertonic solution -If a solution contains less solutes than water, it is hypotonic solution-Isotonic solution c. Facilitated diffusion: transport proteins provide a channel (pore) for medium size molecules or ions. 2. Active: energy needed because things are being moved against their concentration gradient 3. Movement of large proteins, polysaccharides a. Exo-cytosis: removal b. Endo-cytosis: bringing-in II. Functions A. Define cell boundaries B. Organize internal cell structure C. Mediate cellular interations membrane proteins...
View Full Document
- Fall '08
- Membranes, cellular membrane bilayer, C. Mediate