BISC207 Lecture Notes - Lecture 11: Osmosis, Transmembrane Domain, Covalent Bond
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BISC207 Full Course Notes
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Osmosis- the (not so) special case for water. Membrane allows passage of water but not solute. Outside is hypertonic to the inside (in example) Equal water and solute concentrations on either side of the membrane. Solute concentration is higher (and water concentration lower) on outside of the membrane. Solute concentration is lower (and water concentration higher) on outside of the membrane. Water molecules are moving into and out of the cell. How to get large and/or charged molecules across cell membranes - facilitated diffusion. Channel is an opening in the membrane that allows molecules across. 2 classes based on manner of movement. * form an open passageway for the direct diffusion of ions or molecules across the membrane. * also known as carriers, conformational change transports solute, principal pathway for the uptake of organic molecules, such as sugars, amino acids and nucleotides. Hydrolyze- breaking some sort of covalent bond.