Bio Lecture 9 - Bio Lecture 9 (9/26/11) Membrane transport...

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Bio Lecture 9 (9/26/11) Membrane transport o Passive- cell doesn’t use any energy (ATP) to perform this. Includes simple diffusion, and facilitated diffusion Active Transport- uses energy in the form of ATP to move molecules through membrane Diffusion- molecules will naturally move from high concentration to low concentration. Slowly spreads out o DOWN the concentration gradient o Toward higher entropy (disorder) o Energy to move comes from potential energy of concentrated molecules Just because something is in equilibrium doesn’t mean the molecules aren’t still diffusing back and forth At equilibrium, the NET MOVEMENT is 0. There is equal movement in both directions In simple diffusion: o Down the concentration gradient o Energy comes from the high potential energy because of high concentration o Goes through the phospholipid bilayer o Includes all hydrophobic (non polar) molecules, and small molecules o Big molecules like glucose and sucrose and amino acids will not be able to
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This note was uploaded on 10/06/2011 for the course BIO 161 taught by Professor Urbance during the Spring '11 term at Michigan State University.

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Bio Lecture 9 - Bio Lecture 9 (9/26/11) Membrane transport...

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