LuisWeek4ans - Bio D103 Cell Biology Winter 08 Week 4...

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Bio D103: Cell Biology Bio. Department Tutoring Winter 08: Week 4 Lectures 6-8 Review 1/30/08 Wed. 1-3:00 SH157 *Hint: The (+) plus side takes less free [ATP-G-actin] concentration to add and grow. 1.) The critical concentration for the plus end of an AF is 0.12uM, while the critical concentration for the minus end is 0.18uM. At what cellular concentrations of the actin monomer pool would treadmilling occur? Explain your answer. Treadmilling occurs between 0.12-0.18uM (2 points) Treadmilling occurs at this range because: o Above 0.12uM, the plus end polymerizes (grows) o Below 0.18 the minus end depolymerizes (shrinks) 2.) Certain bacteria, such as Listeria monocytogenes , utilize the cell’s actin cytoskeleton for intracellular movement and infection of neighboring cells. How do these bacteria manage to take over the actin cytoskeleton of a cell? A) They secrete molecules that sequester G-actin B) They have surface proteins that nucleate actin C) They induce actin depolymerization
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This note was uploaded on 05/28/2008 for the course BIO SCI D103 taught by Professor Suetterlin/macgregor during the Winter '08 term at UC Irvine.

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LuisWeek4ans - Bio D103 Cell Biology Winter 08 Week 4...

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