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by: Ezequiel Orn


Ezequiel Orn
GPA 3.89

Jerry Brand

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Jerry Brand
Class Notes
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This 11 page Class Notes was uploaded by Ezequiel Orn on Sunday September 6, 2015. The Class Notes belongs to BIO 311C at University of Texas at Austin taught by Jerry Brand in Fall. Since its upload, it has received 14 views. For similar materials see /class/181714/bio-311c-university-of-texas-at-austin in Biology at University of Texas at Austin.




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Date Created: 09/06/15
BIO 31 1 C Spring 2009 You will need to bring a pencil and perhaps a backup pencil to the exam on Friday Nothing else will be required You will not need and should not use a calculator during the exam Exam 1 will consist of 38 multiplechoice questions and 4 additional questions Approximately 13 of the exam will emphasize chemical information provided in Chapters 2 3 and 4 of the textbook in the first two discussion periods and in the most recent lectures Lecture 10 Wednesday 11 Feb 2009 Hydrogen Bonding Between an Aldehyde and an Amine H O H N k Y j R1 C hydrogen bond R2 H amine aldehyde An Intramolecular Hydrogen Bond Reversible Ionization of Water 39 O H 0 H H20 OH H Ionization E lt 4 DeIonlzatlon H H H30 H20 H H Reversible Ionization of Water Shown as a Chemical Reaction Ionization H20 H20 gt H3O OH39 Deionization or ZHZO L H3O OH39 At any instant of time in pure water at room temperature approximately one molecule in 300 million is in the ionized form The longest arrow shown in the reverse reaction indicates that the reaction prefers to go in the reverse reaction and therefore at any instant of time most water molecules are in the nonionized form In pure water at room temperature H3O10397 M pH7 Brackets around a chemical structure are read as quotconcentration ofquot Def pH og10H3O Also in pure water OH39 10397 M Ionization of Carboxylic acids 0 Ionization O deprotonation R C T R C 0 o H H But deprotonation cannot occur unless there is another molecule nearby that can simultaneously accept the proton become protonated Deprotonation of a Carboxylic Acid in Water 0 deprotonation 0 ONH O H H20 H3O protonation net reaction reversible RCOOH H20 R COO H3O Protonation of an Amine in Water H H protonation RNH H 7 H H R N HO 2 deprotonation net reaction reversible R NH2 H20 ltIR Nquot393 OH39 Deprotonation of Phosphoric acid in Water 0 0 fl I de rotonation R 0 0 de rotonation R 0 Fl 0 P Roo I 0 0 0 H H H H H20 protonation H3O H20 protonation H3O net reaction reversible H H 2 Ro 4 Ro 4 R O I abbreviated structures The following abbreviations for phosphoric acids are often used in cell and molecular biology O u A u R O lP O R O P OH 0 OH H organic phosphoric acid Ii H II O P O HO P OH H3PO4 H A OH H inorganic phosphphoric acid R o


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