2007 Exam 4

2007 Exam 4 - NAME: _KEY_ EXAM IV BIOLOGY 231 12 December...

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N A M E : __________KEY_______________ EXAM IV BIOLOGY 231 12 December 2007 ________________________________________________________________________________ -1- GENERAL INSTRUCTIONS: 1. Answer all questions legibly and concisely. 2. Confine each answer to the BOX or SPACE provided. Only what is clearly written in the box or space will be graded! Use the back of the pages for “rough drafts” if you like. 3. SHOW YOUR WORK where appropriate. 4. Make sure that your name is PRINTED LEGIBLY on EACH PAGE. 5. This exam consists of 12 questions on 16 pages and it is worth a total of 100 points. WE WILL NOT OFFER RE-GRADING ON THIS EXAM. If you like, you can pick it up in LILY G-108 after 12/18/07. All unclaimed exams will be shredded on 1 Feb 2008. 6. Have a happy and safe holiday. Information that may be useful: ! Myosin motor proteins translocate along the surface of actin filaments, toward the plus end. ! The major motor proteins that translocate along microtubules are dyneins and kinesins. MT = abbreviation for “microtubule.” ! In the mitotic spindle, kinetochore MTs interact with chromosomes, while polar MTs interact with polar MTs from the opposite half-spindle. Astral microtubules extend toward the cell cortex. !
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N A M E : __________KEY_______________ EXAM IV BIOLOGY 231 12 December 2007 ________________________________________________________________________________ -2- (1) 5 pts. A “sizes” question. NUMBER each of the following molecules or structures in order such that 1 is the LARGEST and 5 is the SMALLEST . In other words, 5 is the SMALLEST and 1 is the LARGEST : _ _ _ 4 ___ MPF (maturation promotion factor) _ _ _ 2 ___ a bacterium _ _ _ 1
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N A M E : __________KEY_______________ EXAM IV BIOLOGY 231 12 December 2007 ________________________________________________________________________________ -3- (2) As you know, “dynamic instability” describes the assembly and disassembly properties of microtubules (MTs). It was first detected as periods of steady growth punctuated by periods of rapid, “catastrophic” disassembly. The latter sometimes ends in a resumption of assembly, called “rescue.” The data below track the length of a MT over 20 min, with the onset of two catastrophes and two rescues noted by the labels and blue arrows. Numbered red arrows point to three stages of MT behavior during dynamic instability. (a) 4 pts. Fill in the answers to the following 4 questions: Question:
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2007 Exam 4 - NAME: _KEY_ EXAM IV BIOLOGY 231 12 December...

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