BIOG 1140 Chapter Notes - Chapter 16: Okazaki Fragments, Telomere, Telomerase
28 Sep 2016
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Dna (deoxyribonucleic acid) key molecule behind inheritance, genetic material. When dna is being copied (synthesis of new dna strands), it is termed dna replication. In beginning, scientists didn"t know whether dna or protein was the genetic material for inheritance. Frederick griffith attempted to test this by experimenting on bacteria. 2 strains of bacteria (one pathogenic, one non-pathogenic) He found that completely killing one strain of pathogenic bacteria, and mixing them with non- pathogenic bacteria caused a conversion of these bacteria to pathogenic bacteria. Other ways that paved path for dna being genetic material included viruses. Bacteriophages are viruses that attack bacterial strains. Virus contains either dna or rna enclosed in a protective protein covering. Alfred hershey and martha chase finally was able to crack the code with their experiment using radioactivity. Used radioactive sulfur to trace fate of viruses" protein coat. Used radioactive phosphorous to trace fate of viruses" dna.
