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Exam 3 F08-1 - BSCI 110A Exam 3 November 3 2008 Print Name...

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BSCI 110A Exam 3 November 3, 2008 Print Name _________________________________ Signature Pledge___________________________________ 1. Read all questions carefully. 2. You will have 50 minutes to complete this exam. 3. Answers are usually short sentences and/or single words. If you write long answers, you will run out of time. 4. Do not start until directed. 5. Good luck!
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1. (6) Fission yeast (S. pombe) is a unicellular eukaryotic organism that has been instrumental in understanding the control of cell division. The protein Wee1 is part of a checkpoint in fission yeast that keeps the cell cycle engine from running faster than cells can grow, thus it maintains constant cell size. Yeast strains containing a mutation in Wee1 duplicate their DNA but then divide into daughter cells prematurely, resulting in smaller than normal cells (wee is Scottish for small). Where in the cell cycle do you think Wee1 acts? In G2 (gap 2) between S-phase replication and the start of mitosis 2. A. (6) What is a nucleosome? B. (6) Acetylation of lysine and arginine residues in the amino-terminal tails of proteins that make up nucleosomes causes a change in the charge of those proteins.
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