BIOSC 0150 Lecture Notes - Lecture 3: Glycerol, Micelle, Cell Nucleus
12 Mar 2016
School
Department
Course
Professor
Document Summary
Those chains may be saturated or unsaturated with hydrogen. Where can lipids be found in a cell: cell membranes lipid bilayer, adipose cells contain huge droplets for energy storage, cushioning, and insulation. Types of lipids include: triglycerides: 1 glycerol and 3 fatty acid tails; stores energy, phospholipids: 1 phosphate and 1 glycerol (polar, hydrophilic head) and 2 fatty acids (nonpolar, hydrophobic tail) Phospholipids in water - membranes: spontaneously arrange into micelles or lipid bilayers, hydrophilic heads interact with water. Hydrophobic tails interact with one another to be shielded from water: lipid bilayers are dynamic; lipids move around within a membrane layer (but movement from one layer to another is rare), lipid composition determines membrane permeability. Non-covalent (van der waals) interactions between neighboring lipids determines fluidity. No unsaturated fatty acids means tight packing and strong van der. Many unsaturated fatty acids cause kinks that prevent tight packing and weak van der waals higher permeability and more fluid.
