Ch16Top10 - Kyra Simon Top Ten Concepts of Chapter 16 1...

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Kyra Simon 5/26/08 Top Ten Concepts of Chapter 16 1) Griffith performed experiments to demonstrate that molecules from dead cells could transform the genes of living cells. Transformation is defined as a change in genotype and phenotype due to assimilation of external DNA by a cell. 2) Avery proved that DNA is the transforming substance that carries information by purifying chemicals from transforming cells and recording that the only chemical that worked alone in transformation was DNA. 3) Hershey and Chase showed that DNA directs the production of a virus by conducting experiments where they infected bacteria with phages (viruses made of protein and DNA), which caused the bacteria to produce more phages. When they labeled the virus with radioactive isotopes, they showed that DNA was sufficient to oversee production of new viral particles. 4) Watson and Crick discovered that DNA molecules are structured as double helixes, or two twisted strands of DNA, built with nucleotide polymers. Each
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This note was uploaded on 10/30/2009 for the course SI 0126 taught by Professor Gourney during the Spring '09 term at École Normale Supérieure.

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Ch16Top10 - Kyra Simon Top Ten Concepts of Chapter 16 1...

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