BIOL 1000 Chapter Notes - Chapter 1: Fluid Mosaic Model, Phospholipid, Glycerol
4 Jan 2018
School
Department
Course
Professor
Document Summary
Cell membrane and membrane transport, membrane functions, forming a barrier selective permeability: some molecules can go directly through the membrane without channels, some cannot, separating different environments: in organelles vs cytosol, the liquid inside the cell. Example: lysosomes (ph of 5 inside, 7 outside in cytosol: maintaining ion gradients: ion gradients are extremely important. The difference between concentration on either side of the membrane is a source of energy. Example: proton concentration gradient at the flagella causes movement: signalling: communication that occurs inside the cells and between cells. The cell membrane is not a double membrane one membrane, two layers = bilayer membrane. Membrane formation is spontaneous which means it can be repaired spontaneously (eg. vesicles: membrane caracteristics. Selective permeability: size and charge affect the rate of diffusion across a membrane. Small and non-polar molecules pass easily - wiggling their way through phospholipids (o2, co2) Water (small and polar) can go through the membrane but slowly, like glycerol and urea.
