handout_hydrogenbonds_revJan17_08 - HYDROPHILIC (water –...

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Hydrogen bonds. oxygen is very “electronegative” and pulls electrons in close oxygen, as a result, forms “polar” covalent bonds with other atoms molecules containing oxygen, as a result, have + and – charges these + and – charges cause the molecules to stick together like magnets these weak magnetic attractions between molecules are called “hydrogen bonds” they can be broken and reform without damaging the molecules Hydrogen bonds also hold the two strands of DNA together (see label a).
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Hydrogen bonds also cause proteins (chains of amino acids) to fold into characteristic shapes. Hydrogen bonds also cause most of the properties of water:
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Unformatted text preview: HYDROPHILIC (water – loving) molecules, such as salt and sugar, form hydrogen bonds with water molecules. Sodium Chloride (NaCl) atoms are loosely held together by ionic bonds. Since each ion has a charge, they are attracted to water molecules and go into “solution.” Glucose (C6H12O6) contains many oxygen atoms and therefore many polar covalent bonds that are attracted to water molecules causing the sugar molecule to go into solution. HYDROPHOBIC (water-fearing) molecules lack oxygen and polar covalent bonds and therefore do not form hydrogen bonds with water molecules. Fats contain little oxygen and thus are not attracted to water....
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This note was uploaded on 05/10/2010 for the course BIOLOGY BSC1010 taught by Professor Wilcox during the Spring '09 term at Broward College.

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handout_hydrogenbonds_revJan17_08 - HYDROPHILIC (water –...

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