Biol223_Smith_09_2004-2005Fall_Final

Biol223_Smith_09_2004-2005Fall_Final - Biol...

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Biol 223_2004Fall_Final FINAL EXAM Wednesday, 19 January, 2005 11:30 am PAGE 1 of 6 Biology 223 Fall 2004 FINAL EXAM EXAM COPY # No notes, no calculators, no phones. Write your name and student ID number at the top of this page. Use non-erasable ink, write on the back as needed for working problems. Write legibly and succinctly, using proper terminology. Show your work and justify your conclusions, partial credit may awarded, likewise negative points may be assigned to unjustified, frivolous, or grossly incorrect answers (the answer to another version of the exam is grossly incorrect). Furthermore, please understand that full credit for questions is awarded to correct, complete, legible, clear, precise, succinct, and properly justified answers in the requested format. If you do not explain your answer, or show your work, I may not give you any credit at all. You need not provide elaborate justification, I just need to see how you obtained your answers, the logic the numbers, diagrams, or calculations, even if on the back of the page. 300 points possible, corresponding to Section I = Exam I (Russell chapters 1-6, 19), 8 or 25% of your course grade. Section II = Exam II (Russell chapters 7, 8, 9, 10, 13, 14), 8 or 25% of your course grade. Section III = Remainder (Russell chapters 16-18), 9% of your course grade. codon chart Second base
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Biol 223_2004Fall_Final FINAL EXAM Wednesday, 19 January, 2005 11:30 am PAGE 2 of 6 SECTION I Question 1 for 15 points The following four heterocycles are the bases found in normal DNA. a) Indicate their single letter code below each structure. b) Circle the atom of each base by which it is connected to the deoxyribose. c) Circle the hydrogens that donate hydrogen bonds to the normal partner in B-form DNA. d) Draw as two dots ( : ), so as to indicate their precise position and orientation, those lone pairs that accept hydrogen bonds from the normal partner in B-form DNA. N N NH N NH 2 N NH NH N NH 2 O NH N H O O C H 3 N NH NH 2 O Question 2 for 5 points Hershey and Chase showed that when phages were labeled with isotopes and used to infect bacteria, phage protein remained outside the bacteria, and phage DNA entered the bacteria and became part of new phage. What distribution would you expect if the phage had been grown in medium supplemented with isotopes of the following isotopes? Use “+” or “0” to indicate presence or absence, respectively. element
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Biol223_Smith_09_2004-2005Fall_Final - Biol...

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