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Unformatted text preview: UNIT THREE: GENETICS Chapter Sixteen: The Molecula Chapter Sixteen: The Molecula Chapter Sixteen: The Molecula Chapter Sixteen: The Molecula (Text from Biology , 6 th Edition, b The Mol The Search for the Genetic Mate DNA and protein were candidate 1940s, most thought proteins, a seemed the most likely to be th Additionally, there was little kno whose physical and chemical pr account for the numerous inher organism. Evidence that DNA Can Transfo Frederick Griffith, in his studies mammals, discovered the genet S strain and a harmless R strain. the harmless strain, some of the Evidence that Viral DNA Can Pr Viruses are DNA (or RNA) enclos Chase studied a virus that infec the genetic material. Viruses th experiment, they worked with t bacteriophages were almost com an E. coli cell into a factory for p lar Basis of Inheritance lar Basis of Inheritance lar Basis of Inheritance lar Basis of Inheritance by Campbell and Reece) olecular Basis of Inheritance (Chapter Sixteen DNA AS THE GENETIC MATERIAL terial Led to DNA tes for genetic material. Until the as the workhorses of the cell, he hereditary material. owledge about nucleic acids, roperties seemed to uniform to rited traits exhibited by every orm Bacteria of Streptococcus pneumonia , a bacterium that tic role of DNA. There were two strains of the ba . When the pathogenic cells were killed with he e living bacteria from the harmless strain were c pathogenic form. This new trait was then inh descendants of the transformed bacteria. Th component of the dead pathogenic cells caus called the phenomenon transformation transformation transformation transformation, whi change in genotype and phenotype due to th external DNA by a cell. His work led to Oswald Avery searching for th transforming substance. He purified various transform live nonpathogenic bacteria with e DNA working. When he and his colleagues an transforming agent, they were greeted with s rogram Cells sed in a protective coat of protein. When Alfred cts bacteria, they were able to find additional evi hat infect bacteria are called bacteriophages bacteriophages bacteriophages bacteriophages, or the T2 phage that normally infects Escherichia co mpletely composed of DNA and protein and that producing more phages. 1 en) causes pneumonia in acterium: a pathogenic eat, and then mixed with converted to the herited by all hus, some chemical sed this change. He ich is now defined as a he assimilation of the identity of the chemicals and tried to each chemical, with only announced DNA as the skepticism. d Hershey and Martha idence that DNA was r phages phages phages phages. In their coli . They knew that t the phage could turn UNIT THREE: GENETICS Chapter Sixteen: The Molecula Chapter Sixteen: The Molecula Chapter Sixteen: The Molecula Chapter Sixteen: The Molecula (Text from Biology , 6 th Edition, b to infect separate samples of E....
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