BIOL107 Lecture Notes - Lecture 7: Lipid Bilayer, Cell Membrane, Aquaporin
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27 Jun 2020
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The plasma membrane is the boundary that separates a living cell in its surroundings. Exhibits selective permeability, allowing some substances to cross it more easily than others. The plasma membrane controls the exchange of materials of a cell with its surroundings. Plasma membranes are selectively permeable, regulating the cells molecular traffic. Hydrophobic (non polar) molecules can dissolve in the lipid bilayer and pass through the membrane rapidly. Polar molecules do not cross the membrane easily. Transport proteins allow hydrophilic substances to pass across membrane. Is specific for the substance it moves. Channel proteins have hydrophilic channel that certain molecules or ions can use as a tunnel (aquaporins facilitate passage of water) Provide corridors (passage way) that allow a specific molecule or ion to cross the membrane. Ion channels facilitate the diffusion of ions. Some ion channels are gated channels - open and close in response to stimuli. Bind molecules and change shape to shuttle them across membrane.
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