DNA Structure and Replication

The best evidence that the ability to fluoresce is a

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discover that some of the living cells are now phosphorescent. The best evidence that the ability to fluoresce is a heritable trait would be an observation that A DNA passed from the heat-killed strain to the living strain. B protein passed from the heat-killed strain to the living strain. C the phosphorescence in the living strain is especially bright. D descendants of the living cells are also phosphorescent. E both DNA and protein passed from the heat-killed strain to the living strain. ____ 8. In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts? A DNA does not contain sulfur, whereas protein does. B DNA contains phosphorus, but protein does not. C DNA contains nitrogen, whereas protein does not. D A and B only E A, B, and C ____ 9. For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work? A There is no radioactive isotope of nitrogen. B Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long. C Meselson and Stahl already did this experiment. D Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive. E Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins. Match the investigator(s) to the appropriate discovery of about the nature of genes. A. Frederick Griffith B. Alfred Hershey and Martha Chase C. Oswald Avery, Maclyn McCarty, and Colin MacLeod D. Erwin Chargaff E. Matthew Meselson and Franklin Stahl ____ 10. Chemicals from heat-killed S cells were purified. The chemicals were tested for the ability to transform live R cells. The transforming agent was found to be DNA. A A B B C C D D E E ____ 11. Phage with labeled proteins or DNA was allowed to infect bacteria. It was shown that the DNA, but not the protein, entered the bacterial cells, and was therefore the genetic material. A A B B C C D D E E ____ 12. In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine. A A B B C C D D E E ____ 13. When T2 phages infect bacteria and make more viruses in the presence of radioactive sulfur, what is the result? A The viral DNA will be radioactive. B The viral proteins will be radioactive. C The bacterial DNA will be radioactive. D both A and B E both A and C ____ 14. Cytosine makes up 38% of the nucleotides in a sample of DNA from an organism. Approximately, what percentage of the nucleotides in this sample will be thymine?
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