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Unformatted text preview: + into the cell. What type of transport protein could be mediating the movement of Na+ into the cell under these conditions? Explain your answer. 2. The resting K + channel is 100 times more permeable to K + than to Na + . Explain the molecular mechanism behind this specificity. 3. At pH 7, tryptophan crosses the membrane at a rate of about 1/1000 the rate of the closely related molecule indole. Explain this observation and comment on why pH is relevant to this question. 4. Under normal physiological conditions, the acetylcholine receptor gated ion channel transports Na+ more readily than K+. However, the channel itself is equally permeable to both Na+ and K+. Given that information, explain why upon binding acetylcholine, the vast majority of the ions flowing through the channel Na+ ions and NOT K+ ions....
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This note was uploaded on 05/06/2010 for the course BIOC 460 taught by Professor Ziegler during the Spring '07 term at Arizona.
- Spring '07