EBIO 1210 Lecture Notes - Lecture 2: Choline, Phospholipid, Scurvy
5 Sep 2016
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This polarity makes water the solvent of life, able to dissolve salts, sugars, and proteins in cells. Water interacts with many of life"s molecules by being attracted to them. Water molecules are also attracted to each other. What does that mean: water is polar = electrons are pulled toward oxygen. Water molecules stick to each other (cohesion). Hydrophilic vs. hydrophobic: hydrophilic: water-loving" molecules have polar (or charged) regions that attract water and mix readily with water (water soluble). Unequal sharing of electrons (electrons held tightly between atoms with different electronegativity). Low chemical potential energy; these bonds cannot serve as an energy source. Makes a substance water-soluble: hydrophobic: water-fearing" molecules are nonpolar, have no attraction for the polar water molecules and do not mix with water (water insoluble). Equal sharing of electrons (electrons held loosely between atoms of the same or similar electronegativity). Nonpolar covalent bond (atoms have no charge) ex: c-h bond,
