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Periotl Nanro SECTION 8.1 [)âte IDENTIFYING DNA AS THE GENETIC MATERIAL Study Guide KEY CONCEPT VOCABULARY DNA was identified as the genetic material through a series of experiments. bacteriophage MAIN IDEA: Griffith finds a "transforming principle." Write the results of Griffith's experiments in the boxes below. Expetiments Results 1 lnjected mice with R bacteria 2 lnjected mice with S bacteria 3 Killed S bacteria and injected them into mice 4 Mixed killed S bacteria with bacteria and injected them into mice R Found live S bacteria in the mice's blood c o o E ()o .c + =c E O) l o I 5. Which type of bacteria caused disease, the S form or the R form? 6. What conclusions did Griffith make based on his experimental results? a) 'J õo) J o oo oP c o o ()o Unit 3 Besource Book McDougal Littell Biology Study Guide 61 Natr¡c I)r tc ['c¡'iod STUDY GUIDE, CONTINUED MAIN IDEA: Avery identifies DNA as the transforming principle. 7. Avery and his team isolated Griffith's transforming principle and performed three tests to learn if it was DNA or protein. In the table below, summarize Avery's work by writing the question he was asking or the results of his experiment. Avery's Ouestion Results What Çpe of molecule does the transforming princlple contain? The ratio of nitrogen to phosphorus in the transforming principle is similar to the ratio found in DNA. Which type of enzyme destroys the ability of the transforming principle to function? MAIN IDEA: Hershey and Chase confirm that DNA is the genetic material. 8. Proteins contain 9. DNA contains but very little but no 1O. Summarize fhe two experiments performed by Hershey and Chase by completing the table below. Identify what type of radioactive label was used in the bacteriophage and whether radioactivity was found in the bacteria. Experiment Experiment Bacteriophage Bacteria C o oE o O c =Co E o) l 1 o I Experiment 2 c) F 'a G o) l o ôU Vocabulary Check 11. Explain what a bacteriophage is and describe or sketch its structure. €, E '-o o o O 62 study Guide Unìt 3 Besource Book McDougal Littell Biology