B M B 211 Lecture Notes - Lecture 3: Red Blood Cell, Hemolysis, Semipermeable Membrane
12 Sep 2016
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Oxygen bears partial negative charge and each hydrogen is partially positive making water a polar molecule. Water is a dipole: its charges are separate. Hydrophilic (water loving): possess positive or negative charges or contain large numbers of electronegative oxygen or nitrogen atoms (ex. Hydrophobic (water hating): possess few electronegative atoms; do not interact with water (ex. Hydrogen bond: electron deficient hydrogens on water are attracted to unshared electrons on the oxygen of another water molecule. Hydrogen bonds are responsible for the double helix in dna. Covalent bonds > ionic interactions > hydrogen bonds > van der waals forces. Occurs when a pair of electrons is shared by atoms. Atoms gain stability because they now have a full electron shell. Don"t always share electrons equally (this is the difference between a polar and non-polar covalent bond) Oppositely charged molecules are attracted to each other, while same (like) charges repel.
