Review Chapter 8 Test

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Class Topics
Title Biology 3/8/07
Objectives

• To learn about the historical discoveries
  surrounding the genetic material, DNA.

• Review Chapter 8 Test
• Notes Chapter 9
• When you fall, pick something up."
• Oswald Avery

Sunday, August 23, 2015 1235 PM
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Class Assignments
By When
What

• W.S. 9.1 3/8/07
• Chapter 9 Quiz 1 3/12/07
• Due this class period
• Due next class period
• Due in the future

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Grade Sheet
2A p. 157 (5 pts.)
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Averys conclusion

• Carbohydrase didnt block transformation
• Proteases didnt block Transformation
• Ribonuclease didnt block transformation
• Deoxyribonuclease blocked transformation
• Whats the conclusion?
• DNA is the genetic material of bacteria

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Averys experiment

• Problem
• Hypothesis
• Procedure
• Conclusion

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From http//ribonode.ucsc.edu/HuGen/01_80H/01_80H
lec6.html
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Hershey-Chase Experiment

• 1952 - Alfred Hershey and Martha Chase worked
  with viruses to support the conclusion that DNA
  is the genetic material
• The specific viruses were bacteriophages (phages)
• infects bacteria
• Contain both DNA and Protein

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Radioactive Isotopes

• Isotope - same element (number of protons) but
  different numbers of neutrons
• Unstable or radioactive (releases energy)
• Used to follow the different elements throughout
  the experiment
• Phosphorus-32 - DNA not protein
• Sulfur-35 - protein not DNA

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Graphic taken from the MIT Hypertext
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From http//osulibrary.orst.edu/specialcollection
s/coll/pauling/dna/pictures/hersheychase-experimen
t.html
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Chapter 9 Quiz 1 Review

• Describe 1 of the 3 experiments
• Griffith, Avery, or Hershey/Chase
• Problem
• Hypothesis
• Procedure
• control experimental groups, independent
  dependent variables
• Data
• Conclusion