BIOLOGY 172 Lecture Notes - Lecture 1: Amine, Peptide, Alpha Helix

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15 Sep 2016
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Life originated in, and is based on, water. Great solvent, substances dissolve easily in it. H-o bonds in water are polar covalent. Cohesion: because water molecules at the surface hydrogen-bond with water molecules below them, they experience a net downward pull. Adhesion: water molecules at the surface adhere to the glass, allowing them to resist the downward pull of cohesion. Liquid water denser than ice, so ice floats. Hydrogen bonds form when the partial positive charge of hydrogen atoms are attracted to the partial negative charge of oxygen atoms. Specific heat capacity: energy needed to heat 1 gram by 1 degree. Bodies of water can absorb heat from sun and only modestly increase in temperature. At night and during winter, warm water will warm air. This is why coastal areas have more moderate temperatures than inlands. Fantastic solvent, hydrogen bonds between h2o and polar molecules/ions help substances stay in solution. Nonpolar molecules do not easily dissolve in water.

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