exam2_w08_key

exam2_w08_key - BIOLOGY 2A UCD WINTER 2008 EXAM 2A ROTH /...

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1 B IOLOGY 2 A E XAM 2 A UCD W INTER 2008 R OTH / G ERHART S TUDENT N AME __________________________________________________________ ID _____________________________________________________________________ Instructions (2.5 points): Fill in your name and student ID number on the scantron and last page of your exam booklet . Be certain that the bubbles of the scantron are filled in with your ID number and the correct version of your exam (found at the end of the Multiple Choice questions). Mark your scantron! Remove the code table for help in answering some questions. Mark the next to last page (multiformat page) in PEN (answers in pencil not eligible for re-grading). Tear off the (multiformat) page and turn it in separately from the scantron. B EST OF L UCK ON THE E XAM ! Scoring: Multiple choice (35 questions @ 2.5 points each) = 87.5 points + Multi-format page (10 points) + following directions (2.5 pts) __________________________________________________ = 100 points possible
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2 Part 1: Choose the best answer (or where indicated, two answers) to the following questions. 1. What aspect of biological information processing DOES NOT involve adding nucleotides at the 3’ end of a growing polynucleotide chain? A. Chromosome replication B. transcription C. translation D. DNA excision repair E. “Two-looks” editing during replication 2. Which aspects of cell biology require the ability of complementary single strands of DNA to reanneal to form a duplex? A. DNA replication AND excision repair B. Editing in replication AND translation (two-looks) C. Translation AND transcription D. Recombination AND Making a deletion mutation E. Formation of base substitutions AND frameshift mutations 3. At what 3-base DNA sequence could transition mutations occur that generate a UAG or a UGA nonsense mutation, but not a UAA nonsense mutation? Write the sequence of the DNA sense strand (resembles the mRNA) 5’ to 3’. A. GGA B. UGG C. CCA D. TGG E . TAA 4. The bases adenine (A) and guanine (G) are purines – the other two (cytosine C and thymidine T) are pyrimidines. Based on your knowledge DNA structure, why are transition mutations (A/T G/C) more common than transversion mutations (all other kinds of base substitutions?) A. A/T base pairs are more common than G/C base pairs. B. It’s easier for repair systems to recognize mispaired bases that are purine: purine or pyrimidine:pyrimidine pairs. C. The enzyme responsible for replicating DNA seldom mistakes a purine for a pyrimidine, but it more often confuses two purines or two pyrimidines. D. There’s no firm reason; it’s just the way things are. E. Both b and c are reasonable and likely to contribute to the high frequency of transitions. 5.
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exam2_w08_key - BIOLOGY 2A UCD WINTER 2008 EXAM 2A ROTH /...

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