Bis2A_exam3a_spr09

Bis2A_exam3a_spr09 - BIOLOGY 2A UCD SPRING 2009 EXAM 3A...

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B IOLOGY 2 A E XAM 3 A UCD S PRING 2009 G ERHART S TUDENT N AME __________________________________________________________ ( PRINTED ) Instructions (5 points): Fill in your name and student ID number on the scantron and the first and last pages of your exam booklet and SIGN below if you consent to picking your exam up from the bins. Be certain that the bubbles of the scantron are filled in with your ID number and the correct version of your exam (found on the next page). Mark your scantron! Mark the last page (multiformat page) (answers recorded in pencil can not be re- submitted for re-grading). Tear off the last page and turn it in separately from the scantron. B EST OF L UCK ON THE E XAM ! Scoring: Multiple choice (30 questions @ 2.5 points each) = 75 points + Multi-format page (20 points) + following directions (5 pts) __________________________________________________ = 100 points possible Authorization for Public Distribution of Graded Examination . I, _________________________________________, ID#: ________________________ authorize the instructor to return the graded exam to me by placing it in the labeled course return bin on the second floor of Sciences Lab Building for me to pick up.
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Choose the best answer for each question. Mark more than one answer ONLY when SPECIFICALLY told to do so. 1. An organism lives in the cold soils of Antarctica. How could the cell membrane of this organism be modified so that it functions under cold conditions? A. Increase the number of integral proteins. B. Increase the number of peripheral proteins C. Increase the saturation of the phospholipid fatty acid tails. D. Increase the length of the fatty acid tails. E. None of the choices are correct. Use the following information to answer the questions below. The lettered circles below represent a diploid nucleus with four chromosomes. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is symbolized as black and the other haploid set is gray. The chromosomes in the unlettered circle have not yet replicated. Choose the correct chromosomal conditions for the following stages. 2. one daughter nucleus at prophase of mitosis. B 3. one daughter nucleus at prophase of meiosis II. C 4. one daughter nucleus at telophase of meiosis II. A 5. Which of the following would likely move through the lipid bilayer of a plasma membrane least rapidly? A. O 2 B. nucleotides C. glucose D. water E. K+
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The figure above describes bacterial genes that control a sugar-degrading pathway. The promoter is subject to a positive controller or activator (which allows polymerase to bind when the cell needs more energy) and a negative controller or repressor (which binds tightly to its site whenever the substrate sugar is NOT available). The dotted circle above shows the space occupied by the repressor when bound. RNA polymerase is NOT attracted to the promoter in the absence of the positive controller. 6.
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Bis2A_exam3a_spr09 - BIOLOGY 2A UCD SPRING 2009 EXAM 3A...

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