Biol223_Smith_07_2004-2005Fall_ExamI

Biol223_Smith_07_2004-2005Fall_ExamI - Biol223_Smith Exam I...

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Biol223_Smith Exam I 06 November 2004 PAGE 1 of 6 Exam # Biology 223 Fall 2004 Exam I, 06 November 2004 9:00 am - 10:50 am 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 if needed. Write legibly and succinctly, using proper terminology. Show your work and justify your conclusions, partial credit may awarded. Negative points may be assigned to unjustified, frivolous and grossly incorrect answers. 100 points possible, 110 minutes. Note points per question and spend your effort accordingly! codon chart Second base
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Biol223_Smith Exam I 06 November 2004 PAGE 2 of 6 Exam # Question 1 for 5 points What is the diameter of a double-stranded DNA in a B-form helix? Question 2 for 5 points Consider a diploid organism with 6 pairs of chromosomes, each parent contributing one of each pair. Assuming no crossing over, how many genetically distinct gametes would it be expected to produce? Question 3 for 5 points The 2 DNA oligonucleotides are heated in cooled together. Predict how they might hybridize: 5’-GGCATTCTTATTAGGCGGCTTA-3’ 5’-GCCTAATAAGAATGCCGCCAAT-3’ Question 4 for 5 points Polio is a positive-stranded RNA virus that replicates via a negative-stranded RNA intermediate. If the positive strand is 30% G, and 20% A, and 10% C, what would be the expected composition of the negative strand?
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Biol223_Smith Exam I 06 November 2004 PAGE 3 of 6 Exam # Question 5 for 5 points If an organism replicated its double-stranded DNA using a conservative mechanism, draw and label the centrifuge tubes of Meselson and Stahl would have seen without isotopically-enriched media (U), and after 0, 1, 2, and 3 generations after switching from isotopically-enriched media to natural abundance media. Question 6 for 5 points
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Biol223_Smith_07_2004-2005Fall_ExamI - Biol223_Smith Exam I...

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