BIO CHP14

BIO CHP14 - DNA: The Genetic Material Chapter 14 Genes seem...

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DNA: The Genetic Material Chapter 14
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Genes seem to be involved with inclinations to “want” to perform certain behaviors
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4 The Genetic Material Frederick Griffith, 1928 studied Streptococcus pneumoniae , a pathogenic bacterium causing pneumonia there are 2 strains of Streptococcus : - S strain is virulent - R strain is nonvirulent
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5 The Genetic Material Griffith’s conclusion: - information specifying virulence passed from the dead S strain cells into the live R strain cells - Griffith called the transfer of this information transformation
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6 The Genetic Material , 1944 repeated Griffith’s experiment using purified cell extracts and discovered: - removal of all protein from the transforming material did not destroy its ability to transform R strain cells - DNA-digesting enzymes destroyed all transforming ability - the transforming material is DNA
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7 The Genetic Material Hershey & Chase, 1952 - investigated bacteriophages : viruses that infect bacteria - the bacteriophage was composed of only DNA and protein - they wanted to determine which of these molecules is the genetic material that is injected into the bacteria
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8 The Genetic Material - Bacteriophage DNA was labeled with radioactive phosphorus ( 32 P) - Bacteriophage protein was labeled with radioactive sulfur ( 35 S) - radioactive molecules were tracked - only the bacteriophage DNA (as indicated 32
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9
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10 DNA Structure DNA is a nucleic acid . The building blocks of DNA are nucleotides , each composed of: a 5-carbon sugar called deoxyribose a phosphate group (PO 4 ) a nitrogenous base adenine, thymine, cytosine, guanine
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11 DNA Structure The nucleotide structure consists of the nitrogenous base attached to the 1’ carbon of deoxyribose the phosphate group attached to the 5’ carbon of deoxyribose a free hydroxyl group (-OH) at the 3’ carbon of deoxyribose
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BIO CHP14 - DNA: The Genetic Material Chapter 14 Genes seem...

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