Biology 2382B Lecture Notes - Lecture 7: Glucose Transporter, Partition Coefficient, Uniporter
4 Apr 2016
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Document Summary
Need to import and export large or charged molecules. Membranes are semipermeable, so some things can get across, but need transport to get most things across. Types of transporters: (these terms don"t tell what type of transport, they just tell you how many molecules are moving) Symporter: 2 molecules moving in same direcion. Aniporter: 2 molecules moving in opposite direcions. Pores and channels are the same thing - a hole for things to get through. Passive difusion: molecules crossing a membrane (does not require energy) Driven by a concentraion diference and a pariion coeicient. Molecule will move from area of high conc to area of low conc by passing plasma membrane if it is able to. Membrane is semipermeable: small, uncharged molecules can pass through but large, charged molecules can"t. If a molec is small and uncharged, how fast it can pass through depends on the k (pariion coeicient)
