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Bio 5A LECTURE 2&3

Bio 5A LECTURE 2&3 - Outline for Today...

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Outline for Today Electronegativity Covalent bond Ionic bond Hydrogen bond
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CHEMICAL BONDING IN BIOLOGY At. At. # # of Own Val. e - Forms H 1 1 1 covalent bond C 6 4 4 covalent bonds N 7 5 3 covalent bonds O 8 6 2 covalent bonds Na 11 1 Na + ; ionic bond Mg 12 2 Mg 2+ ; ionic bonds P 15 5 5 covalent bonds S 16 6 2 covalent bonds Cl 17 7 Cl - ; ionic bond K 19 9 K + ; ionic bond Ca 20 10 Ca 2+ ; ionic bonds
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NON-POLAR COVALENT BONDING
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POLAR COVALENT BONDING
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ELECTRONEGATIVITY: the ability of an atom in a molecule to attract shared electrons to itself
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ELECTRONEGATIVITY: the ability of an atom in a molecule to attract shared electrons to itself increases from left to right through the Periods of the Periodic table Decreases from top to bottom through the Groups of the Periodic table
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IONIC BONDING
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HYDROGEN BONDS : weak bonds formed when a hydrogen atom covalently bonded to one electronegative atom (oxygen or nitrogen) is attracted to another electronegative atom because of the attraction of opposite charges
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Watson Crick DNA: The Molecule of Life
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Secondary structure: formed within the polypeptide chain due to hydrogen bonding
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Cellulose is formed from D-Glucose by 1-4 glycosidic linkages
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