BIOL 3510 1st Edition Lecture 10 Outline of Last Lecture I Types of Lipids II Determinants of Membrane Fluidity III Maintenance of Membrane Fluidity Outline of Current Lecture I Membrane Structure Continued II Membrane Transport III Permeability and Impermeability IV Three Types of Active Transport Current Lecture Transmembrane proteins cross membranes with alpha helices or B barrels Membranes are disrupted by amphipathic detergents Plasma membrane is supported by the cell cortex Proteins can be confined to membrane domains The carbohydrate layer coats and protects the surface of the cell It is also involved in cell cell recognition Ion concentrations differ inside and outside of a cell Charges need to balance inside and outside of the cell Lipid bilayers are permeable to 1 Non polar molecules 2 Small uncharged polar molecules and impermeable to 1 Ions 2 Large uncharged polar molecules Two types of membrane transport proteins are transporters which move molecules that bind to a binding site and channel proteins which are molecules with the right size or charge that can move through the protein The concentration gradient of a solute determines if its movement across the membrane requires active or passive transport 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 movement of charged molecules is controlled by the electrochemical gradient An example of passive transport is a glucose transporter Three types of active transport 1 ATP driven pump 2 Coupled pump 3 Light driven pump An example of an ATP driven pump is a Na K pump or a Ca2 pump Two types of coupled pumps participate in coupled transport such as glucose Na symport Transferring glucose across the epithelial cell layer of the gut requires active and passive transport An example of a light driven pump is Bacteriorhodopsin
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