BI110 Lecture Notes - Lecture 3: Phospholipid, Electronegativity, Hydrophile

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19 Oct 2016
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A molecule with an uneven distribution of charge is polar. Electronegative oxygen atom associates with electropositive hydrogen atoms of adjacent water molecules to form hydrogen bonds. Partial (-) charge on oxygen, partial (+) on hydrogen. Hydrogen bonds are also important in dna proteins. Not covalent bonds always being broken and reformed. Any water molecule typically has hydrogen bonds with 3 other water molecules. A solvent is a fluid in which another substance, called a solute can be dissolved. Polar/charged molecules form hydrogen bonds or ionic bonds with water molecules. Hydrophilic molecules that can be dissolved in water. Sugars, dna, rna, organic acids, and some amino acids. Hydrophobic do not dissolve in water. Tend to coalesce with each other in water. Water molecules tend to exclude molecules that disrupt hydrogen bonding. Hydrophobic interactions are a major driving force in folding of molecules (like proteins), assembly of cellular structures, and membrane organization. Amphipathic molecules have distinct polar and non-polar regions.

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