BIOL 1107K Chapter Notes - Chapter 6: Fluid Mosaic Model, Transmembrane Protein, Cell Membrane
Document Summary
Fluid mosaic model: many things stuck on cell membrane that are free to move around, two types of membrane proteins. Allow passage: membranes also have carbohydrates on the outer surface. Allows connection between cell and what interacts with the cell. Same molecule sticks out from both: heterotypic. Recognizes if cell should bind: cell junctions. Gap junction: not meant to hold cells together. Channels that allow communication: cell membranes also adhere to extracellular matrix. Integrin: transmembrane protein, binds to matrix outside of the cell. Selective permeability: some substances can come in, but not all, passive transport no energy required, diffusion, active transport: energy required. Diffusion: process of random movement towards equilibrium, rate depends on. Diffusion of water from high to low concentration. Concentration of water outside of the cell is the same as on the inside of the cell (flaccid) Talking about what is going on outside of the cell. More water outside of the cell (turgid)
