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Worksheet+10+-+Answer+Key - Bio 93 Worksheet 10 Lectures 20...

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Bio 93 Pooja Patel Worksheet 10 – Lectures 20 and 21 patelph@uci.edu Lecture 20: DNA Experiments: o S cells: deadly R cells: harmless o 4 different strains of bacteria inserted into different mice Living S cells: mouse dies Living R cells: mouse lives Heat-killed S cells; mouse lives Heat killed S cells and living R cells: Mouse dies Why? o Hershey and Chase Showed that DNA is genetic material Attached radioactive sulfur to proteins in phages o New cells were not radioactive Attached radioactive phosphorus to DNA in phages o New cells were radioactive o Watson and Crick (1953) Proved DNA is a double helix Made this assumption off of facts: o DNA is a linear polymer of 4 types of bases linked by sugar- phosphate groups o Ratio of bases is always A = T, G = C
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Bio 93 Pooja Patel Worksheet 10 – Lectures 20 and 21 patelph@uci.edu DNA is a linear polymer o Nucleotides attach in single straight lines o Phosphate group of one nucleotide is attached to the sugar on the next nucleotide in line
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Worksheet+10+-+Answer+Key - Bio 93 Worksheet 10 Lectures 20...

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