genetics test 2 Green-test_39007

genetics test 2 Green-test_39007 - Biol 3301 Exam#2 Green...

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Biol 3301 Exam #2 Green October 27, 2009 This exam consists of 27 questions worth a total of 100 points. All questions are multiple choice and there is ONE best answer for each question. Record your answers on the scantron sheet – answer only once for each question or you will automatically be marked wrong. Use a #2 pencil. Make sure to fill in your Peoplesoft ID number on the scantron sheet. Name : Thuy Tien Ho ID#
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1. What is the name of the enzyme that, during DNA replication, extends the lagging strand from the 3’ end of each RNA primer? A. DNA polymerase I. B. DNA polymerase III. C. Primase. D. Replicase. E. Topoisomerase. 2. What would you expect to happen during DNA replication in a cell lacking topoisomerase? A. DNA ahead of the replication fork would become increasingly tightly coiled. B. Okazaki fragments would not be joined. C. DNA polymerase I could not displace the RNA primer at the 5’ end of Okazaki fragments. D. Only lagging strand DNA synthesis would halt. E. All of the above. 3. What observation(s) were crucial in allowing Watson and Crick to propose the double helix structure of DNA? A. Chargraff’s rules concerning the relative frequency of different nucleotides and Franklin’s X-ray diffraction of the DNA molecule. B. Griffith’s observation of a transforming factor. C. Hershey and Chase’s demonstration of DNA as a genetic material. D. The determination of the genetic code. E. All of the above. 4. Which of the following distinguishes RNA from DNA? A. RNA is not as strong as DNA. B. RNA has an oxygen at the 2’ position of ribose. C. RNA has 6 different nucleotides. D. DNA has an oxygen at the 2’ position of ribose. E. RNA lacks peptide bonds.
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5. Which answer combines the correct responses to the questions below? (i) What is the name of the structure shown below? (ii) What is its function in transcription? (iii) What is the probable base composition of the region marked by the “A” arrow? (iv) What is the probable base composition of the region marked by the “B” arrow? A. (i) Hairpin loop; (ii) Termination of transcription in prokaryotes; (iii) G/C rich; (iv) string of U’s. B. (i) Hairpin loop; (ii) Termination of transcription in prokaryotes; (iii) string of U’s; (iv) G/C rich. C. (i) Hairpin loop; (ii) Termination of transcription in prokaryotes; (iii) G/C rich; (iv) string of G’s. D. (i) Hairpin loop; (ii) Termination of transcription in prokaryotes; (iii) A/U rich; (iv) string of U’s. E. None of the above. 6. In what way did the Avery, MacLeod and McCarty experiment build on Griffith’s experiment? They: A. Mistakenly identified proteins as the transforming factor because of the use of crude enzyme extracts. B. Identified the transforming principle as a nucleic acid but couldn’t
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genetics test 2 Green-test_39007 - Biol 3301 Exam#2 Green...

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