BIOL 3510 1st Edition Lecture 10 Outline of Last Lecture I. Types of LipidsII. Determinants of Membrane FluidityIII. Maintenance of Membrane FluidityOutline of Current Lecture I. Membrane Structure ContinuedII. Membrane TransportIII. Permeability and ImpermeabilityIV. Three Types of Active TransportCurrent LectureTransmembrane 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 thesurface 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 molecules2. Small uncharged, polar moleculesand impermeable to:1. Ions2. Large uncharged, polar moleculesTwo types of membrane transport proteins are transporters which move molecules that bind toa 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 pump2. Coupled pump3. Light-driven pumpAn 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
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