BIOL 1000 Study Guide - Midterm Guide: Semipermeable Membrane, Logarithmic Scale, Titration Curve

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16 Nov 2017
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The (cid:448)e(cid:396)y diffe(cid:396)e(cid:374)t elect(cid:396)o(cid:374)egati(cid:448)ity"s of h a(cid:374)d o (cid:373)ake (cid:449)ate(cid:396) a highly pola(cid:396) (cid:373)olecule, capable of forming hydrogen bonds with itself and with solutes. Hydrogen bonds are fleeting, primarily electrostatic, and weaker than covalent bonds. Water is a good solvent for polar (hydrophilic) solutes, with which it forms hydrogen bonds, and for charged solutes, with which it interacts electrostatically. Nonpolar (hydrophobic) compounds dissolve poorly in water; they cannot hydrogen-bond with the solvent, and their presence forces an energetically unfavorable ordering of water molecules at their hydrophobic surfaces. Weak, noncovalent interactions, in large numbers, decisively influence the folding of macromolecules such as proteins and nucleic acids. The physical properties of aqueous solutions are strongly influenced by the concentrations of solutes. When two aqueous compartments are separated by a semipermeable membrane (such as the plasma membrane separating a cell from its surroundings), water moves across that membrane to equalize the osmolarity in the two compartments.

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