2006 Exam 4

2006 Exam 4 - NAME: _KEY_ EXAM IV BIOLOGY 231 14 December...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
NAME: __________KEY_______________ EXAM IV BIOLOGY 231 14 December 2006 ________________________________________________________________________________ -1- GENERAL INSTRUCTIONS: 1. Answer all questions legibly. 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 11 questions on 14 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 2-226 after 12/19/06. All unclaimed exams will be shredded on 1 Feb 2007. 6. Have a happy and safe holiday. Information that may be useful: ! The 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, chromosomal MTs interact with chromosomes, while polar MTs interact with polar MTs from the opposite half-spindle. Astral microtubules extend toward the cell cortex. ! On this day in 1911, Norwegian explorer Roald Amundsen and his team became the first to reach the South Pole, beating their rival, Briton Robert Falcon Scott, by a month. Scott also reached the Pole but perished during the return journey, freezing to death only 11 miles from base camp.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
NAME: __________KEY_______________ EXAM IV BIOLOGY 231 14 December 2006 ________________________________________________________________________________ -2- (1) 6 pts. A “sizes” question. NUMBER each of the following molecules or structures in order such that 1 is the LARGEST and 6 is the SMALLEST . In other words, 6 is the SMALLEST and 1 is the LARGEST : ___ 3 ___ MPF (maturation promotion factor) ___ 4 ___ cell cycle kinase (Cdk) ___ 5 ___ cAMP ___ 1 ___ a sea urchin egg ___ 2 ___ a spindle microtubule ___ 6 ___ a phosphate group
Background image of page 2
NAME: __________KEY_______________ EXAM IV BIOLOGY 231 14 December 2006 ________________________________________________________________________________ -3- (2) As you know, under proper buffer conditions actin monomers will polymerize into filaments in vitro. You can measure the extent of assembly over time and plot it on a graph, as we saw in lecture. (a) 5 pts On the axes below, DRAW a typical curve for polymerization of pure actin. LABEL the THREE important parts of the curve with a one or two word description: (b) 2 pts. If you carried out your polymerization reaction just as above, but included an actin-nucleating protein in the tube, in what way would your plot look different? BE SPECIFIC.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 15

2006 Exam 4 - NAME: _KEY_ EXAM IV BIOLOGY 231 14 December...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online