Midterm 4 - Midterm 4-v2 postmortem User ID: bthames3...

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Midterm 4-v2 postmortem User ID: bthames3 Attempt: 1 / 5 Out of: 108 Started: December 12, 2006 08:28 Finished: December 12, 2006 08:36 Time spent: 8 min. 6 sec. Student finished 41 min. 54 sec. ahead of the 50 min. time limit. Question 1 (2 points) 1. In his transformation experiments, Griffith observed that Student response: Student Response Answer Choices a. A. mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic. b . B. infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains. c. C. mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form. d . D. mice infected with a pathogenic strain of bacteria can spread the infection to other mice. e. E. mutant mice were resistant to bacterial infections. Score: 2 / 2 Question 2 (2 points) 2. Avery, McCarthy and MacLeod made the following discovery:
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Student response: Student Response Answer Choices a. A. In DNA of any species the amount of A equals the amount of T b . B. Phage labeled with proteins or DNA was allowed to infect bacteria, but the DNA, nor protein entered the cells c. C. Chemicals from heat killed S cells were purified and tested, as they could transform the R cells. The transforming agent was found to be DNA d . D. DNA must be double helix e. E. All of the above Score: 2 / 2 Question 3 (2 points) 3. What kind of chemical bond is found between sugars and phosphates in the double helix? Student response: Student Response Answer Choices a. A. sulphhydryl b. B. phosphodiester c. C. ionic d. D. hydrogen e. E. phosphate Score: 2 / 2 Question 4 (2 points) 4. Cytosine makes up 38% of the nucleotides in a sample of DNA. Approximately what percentage of the nucleotides in this sample will be thymine? Student response: Student Response Answer Choices a. A. 12 b. B. 24 c. C. 31 d. D. 38
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Score: 2 / 2 Question 5 (2 points) 5. Which enzyme catalyzes the elongation of a DNA strand in the 5'-3' direction ? Student response: Student Response Answer Choices a. A. primase b. B. DNA ligase c. C. Topoisomerase d. D. DNA polymerase e. E. All of the above Score: 2 / 2 Question 6 (2 points) 6. In an analysis of the nucleotide composition of DNA, which is true? Student response: Student Response Answer Choices a. A. A = C b. B. A = G, and C =T c. C. A + C = G + T d. D. G + A = T + C e. E. Both C and D Score: 2 / 2 Question 7 (2 points) 7. You briefly expose bacteria undergoing DNA replication to radioactively labeled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes. One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). These two classes of DNA probably represent
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Student response: Student Response Answer Choices
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This note was uploaded on 04/29/2008 for the course BIO 1510 taught by Professor Unknown during the Fall '07 term at Georgia Institute of Technology.

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Midterm 4 - Midterm 4-v2 postmortem User ID: bthames3...

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