Bio D103 Homework 2_Week 3-KEY

Bio D103 Homework 2_Week 3-KEY - Bio D103: Cell Biology...

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Bio D103: Cell Biology Dr. Salme Taagepera Winter 2009 Bio D103: Homework #2 – KEY! DUE: Friday, January 23, 2009 at the BEGINNING of class. NOTE: The purpose of this assignment is to promote your understanding of the lecture topics by giving you time to think about the material. We do not want students to be distracted during class by last-minute homework efforts, so any homework handed in after the first ten minutes of class will be considered late and will receive half-credit . This homework assignment can be done open-book, however please work alone . Again, this will promote better individual learning. The homework will be graded based on both correct answers and effort! 1. Under which conditions does F-actin: (5 points) A. Treadmill B. Shrink on both ends C. Grow on both ends D. Grow only at the + end Note: C cyto refers to G-actin(ATP) Place letter here Condition C. growth both ends C cyto > C c- > C c+ B. shrink both ends C cyto < C c+ < C c- A. treadmilling C c+ < C cyto < C c- D. growth + end In the presence of a (-) capping protein and C cyto >Cc+ B. shrink both ends In the presence of a large excess of G-actin-ATP sequestering protein, thymosin-β4
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Bio D103: Cell Biology Dr. Salme Taagepera Winter 2009 2. You have purified a protein, MT1, that binds only to GTP-bound tubulin. You proceed to
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Bio D103 Homework 2_Week 3-KEY - Bio D103: Cell Biology...

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