BIOLOGY 201L Chapter Notes - Chapter 2: Phosphodiester Bond, Bond Energy, Unified Atomic Mass Unit

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15 Jan 2016
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Life based on carbon compounds and depends on reactions in aqueous solutions. Life dominated by polymeric molecules - chains of chemical subunits. Life is regulated; cells deploy mechanisms that make sure chem reactions occur at proper place and time. Mass of an atom of molecule is measured in daltons. Living organisms mainly made up of c,h,n, and o (96% of organism"s weight). Molecule - cluster of atoms held together by covalent bonds. Shared electrons form negative charge that is densest between nuclei, and this holds nuclei together by minimizing repulsions. Polar covalent bonds - covalent bonds where electrons aren"t shared equally. Bond between c and h is relatively nonpolar. Bond strength - amount of energy needed to break a bond; kcal/mol or 4. 2kj/mol. Covalent bonds usually stronger than thermal energies by 100-fold. In organisms, they"re only broken during chem reactions controlled by enzymes. With water, covalent bonds 10-100 times stronger than ionic.

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