BSC 2010C Chapter Notes - Chapter 7: Fluid Mosaic Model, Lipid Bilayer, Transmembrane Protein

• School: UCF
• Department: Biology
• Course: BSC 2010C
• Professor: Pamela Thomas

Document Summary

Membranes must be fluid to work properly: evolution of differences in membrane lipid composition d. i. Natural selection favors organisms whose mix of membrane lipids ensures an appropriate level of membrane fluidity for their environment: membrane proteins and their functions. Integral proteins: penetrate the hydrophobic interior of the lipid bilayer e. i. e. ii. Peripheral proteins: not imbedded in the lipid bilayer; appendages loosely bound to the surface of the membrane, often to exposed parts of the integral protein: the role of membrane carbohydrates in cell-cell recognition f. i. Osmosis: the diffusion of free water across a selectively permeable membrane, whether artificial or cellular d. ii. Tonicity: the ability of a surrounding solution to cause a cell to gain or lose water. Isotonic: no net movement of water across the plasma membrane d. iii. d. iv. Hypertonic: more solute compared to less solute either inside the cell or outside the cell d. v.