BIOSC 0150 1st Edition Lecture 1 Outline of Last Lecture I. CarbohydratesOutline of Current Lecture II. LipidsA. Definition of a lipidIII. PhospholipidsIV. Location of lipidsV. Function of phospholipidsVI. Cell Membrane PermeabilityCurrent LectureLipid- 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 componentTriglyceride- ester formed from 1 glycerol and 3 fatty acids- Found in fat/oilPhospholipids- 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 cellsSecretory Cells- lines the ducts in triglyceride to keep the particles separateThese 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 anotherB. Phospholipids in Lipid Bilayers- the hydrophilic heads interact with water and the hydrophobic tails interact with one anotherC. Phospholipids are not static- meaning they move around within layersD. Help to make cell membrane semi-permeable, along with proteinsThe Ability to Cross a MembraneA. High permeability- small, nonpolar molecules and small, uncharged polar moleculesB. Low permeability- large, uncharged polar molecules and ionsC. Saturation and length of a lipid tail determines fluidity and membrane permeability Saturated- hydrocarbon chains that consist of only single bonds between the carbonsUnsaturated- hydrocarbon chains that consist of one or more double bonds between the
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