BIOL 112 Lecture Notes - Lecture 9: Active Transport, Facilitated Diffusion
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BIOL 112 Full Course Notes
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Releases water- entropically driven, water becomes more motionally free. Na+- charged, can"t get through the hydrophobic, non polar membrane. Can think of it as na+ surrounded by water (ion-permanent dipole bond) Hydrophobic component of membrane won"t let it through. Glucose- more polar, forms h-bonds with water. Then have to compare relative size and polarity (ie small and uncharged will be more permeable than large and uncharged) Net movement is down the concentration gradient. Can move in both directions (diffusion by definition is the random movement of particles) Carrier- chemical properties within carrier matches with what it transports. Expends atp always (result is moving something against its concentration gradient) Transporter protein always undergoes conformational (shape) change to transport molecules/ions. Directly uses atp to transport against concentration gradient.
