BIOLOGY 1A03 Study Guide - Final Guide: Osmoregulation, Fibronectin, Lipid Bilayer

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Lovaye Kajiura

Document Summary

Phospholipids move laterally and sometimes very rarely, there is a flip flop of the phospholipids. Rare because of the hydrophilic and hydrophobic going to other side. Cholesterol at moderate temp. cholesterol restrains phospholipids movement (reduces fluidity). Cholesterol prevents the close packing of phospholipids (enhances fluidity). As temp. decreases, strong hydrophobic interactions between saturated hydrocarbon tails cause them to solidify more readily in comparison to unsaturated hydrocarbon tails. To low conc. (water diffuses from low concentration to high concentration when talking about the solute) Movement may or may not be through a membrane. Water diffuses from a region of high concentration of free water molecules to a region of low concentration of free water molecules. Hypotonic: water in cell (cell swells or even bursts) Lysed (swells so much that is bursts ex. Plasmolyzed ( cytoplasm pulls away from plasma membrane ex. Freeze-fracture (helped figure out that the fluid-mosaic model was correct) Membrane splits through the hydrophobic region of the phospholipid bilayer.