chapter 9

chapter 9 - Chapter 9 DNA: The molecule of Heredity Nucleic...

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Unformatted text preview: Chapter 9 DNA: The molecule of Heredity Nucleic Acids: Information storage and transmission.---Genes are the units of heredity and are made of nucleic acid (DNA).---Nucleic acids are polymers of nucleotides linked together by dehydration synthesis reactions. 3 phosphate groups sugar ATP nitrogen- containing base---Nucleotides are the building block molecules of a nucleic acid and are composed of a sugar, a phosphate group, and a nitrogenous base. The sugar and phosphate groups form the nucleic acid backbone. Nucleic acid backbone has directionality (3' versus 5') There are two families of nitrogenous bases: Pyrimidines and Purines---Pyrimidines are nitrogenous bases characterized by a six-membered ring made up of carbon and nitrogen atoms. (Have one ring) sugar phosphate base = cytosine sugar phosphate base = thymine---Purines are nitrogenous bases characterized by a five-membered ring fused to a six-membered ring where both rings are made up of carbon and nitrogen atoms. (Have two rings) sugar phosphate base = adenine sugar phosphate base = guanine In the mid-1920's, Griffith working with Streptococcus pneumoniae demonstrated that genetic material could be transferred from one bacteria to another. Living R strain Bacterial strain(s) injected into mouse Results Conclusions R strain does not cause pneumonia. Living S strain S strain causes pneumonia. Heat-killed S strain Heat-killed S strain does not cause pneumonia. Living R strain, heat-killed S strain A substance from heat-killed S strain can transform the harmless R strain into a deadly S strain. AND PRODUCE LIVE SMOOTH CELLS! The trait from the smooth cell was transferred to the rough cells, and the rough cells were transformed . The rough cells therefore caused pneumonia. The trait from the smooth cell was transferred to the rough cells, and the rough cell were transformed ....
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This note was uploaded on 02/21/2010 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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chapter 9 - Chapter 9 DNA: The molecule of Heredity Nucleic...

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