BIOSC 0150 1st Edition Lecture 1 Outline of Last Lecture I Carbohydrates Outline of Current Lecture II Lipids A Definition of a lipid III IV V VI Phospholipids Location of lipids Function of phospholipids Cell Membrane Permeability Current Lecture Lipid a catchall term for carbon containing compounds that are found in organisms and are largely nonpolar and hydrophobic they do not dissolve in water Lipids are hydrocarbons molecules that contain only carbon and hydrogen The reason lipids don t dissolve in water is because their hydrocarbon component Triglyceride ester formed from 1 glycerol and 3 fatty acids Found in fat oil Phospholipids consist of a glycerol that is linked to a phosphate group and two hydrocarbon chains of either isoprenoids or fatty acids Crucial components of the cell membrane Amphipathic species contains both hydrophilic and hydrophobic components Where do you find lipids in a cell Cell membranes Huge droplets in adipose cells that are used for energy storage cushioning or insulation Large droplets in mammary cells Secretory Cells lines the ducts in triglyceride to keep the particles separate These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute The Function of Phospholipids in water A Phospholipids in Lipid Micelles the hydrophilic heads interact with water and the hydrophobic tails interact with one another B Phospholipids in Lipid Bilayers the hydrophilic heads interact with water and the hydrophobic tails interact with one another C Phospholipids are not static meaning they move around within layers D Help to make cell membrane semi permeable along with proteins The Ability to Cross a Membrane A High permeability small nonpolar molecules and small uncharged polar molecules B Low permeability large uncharged polar molecules and ions C Saturation and length of a lipid tail determines fluidity and membrane permeability Saturated hydrocarbon chains that consist of only single bonds between the carbons Unsaturated hydrocarbon chains that consist of one or more double bonds between the carbons
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