BIOL 112 Lecture : Summary of BIOL 112.pdf
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BIOL 112 Full Course Notes
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Document Summary
2 - small molecules 2: bonds acids and bases. Ionic bond: nonpolar molecules are called hydrophobic. Ionic bonds involve a complete transfer of one or more electrons. Ions are formed when an atom loses or gains electrons. > hydrophobic interaction (exclusion of nonpolar from water) > van der waals interaction (interaction do to fluctuating charges) Buffers: a mole is the amount of a substance in grams whose weight is equal to its molecular weight (6. 022142x10^23 molecules) 1 mol nacl = 23+35. 5 = 58. 5 g. The carboxyl group (-cooh) is common in biological compounds. It functions as a weak acid because it dissociates partially and reversibly. The amino group (-nh2) is an important part of many biological compunds; it functions as a weak base by partially and reversibly accepting h+ ph is the measure of hydrogen ion concentration. Nh2+ h+ -(nh3)+ ph = -log10([h+]) ph 7 = 1 x 10-7 m/l. 3 - buffers and large molecules 1: sugars.
