W2OutlineLec4

W2OutlineLec4 - Luis David Gomez 59866865 Bio 192 D103 Cell...

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Luis David Gomez 59866865 Bio 192 D103 Cell Biology Week 2 Lecture 4 Outline 1/ 14/08 Ion Channels 10^7 to 10^8 ions/sec Two conformation: Closed/Open Selectivity Filter Specific A.A. guide ion through the channel K+ channel: selectivity based on size K+ is right size for filter, interaction with amino acids Na+ is too small to interact with Amino acids residues Regardless of concentration gradient, K+ must line up single file and pass through channel Channel-mediated transport is saturable High Regulation of Opening/Closing of Ion Channels K+ leak channel is not specifically regulated: %50 open, closed C.Q. -- Which statement is true for transporters and ion channels? Transporters and ion channels a)transport molecules against their concentration gradient b)mediate ATP-dependent transport c)contain binding sites for glucose d)have a similar transport rate e)r each a maximal transport rate (Vmax) (a) not all ion channels transport against concentration gradient (the transport down),
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W2OutlineLec4 - Luis David Gomez 59866865 Bio 192 D103 Cell...

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