Lecture 3 - biomolecules (used in class) 9-12

Lecture 3 - biomolecules (used in class) 9-12 - 9.12.07...

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9.12.07 molecules of life chirality sugars DNA proteins
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Which one of these is a dipole? O=O O=C=O H 3 C-OH
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pH Suppose we add 0.010 moles of HCl to 1 liter of pure water at STP. What is the resulting pH? By how many units would the pH change due to the addition of the acid? pH = - log(0.010) = - ( - 2) = 2.0 so, 5.0 pH units lower than pure water.
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CO 2 + H 2 O HCO 3 - + H + Le Chatelier’s Principle Henry Louis Le Chatelier (1850-1936)
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Today’s Mantra: “Tiny differences, huge consequences”
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Biomolecules sugars carbohydrate polymers nucleotides nucleic acids amino acids proteins lipids
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Monosaccharides The simplest of the carbs: (CH 2 O) n Aldoses Aldoses Glyceraldehyde Triose sugars (C 3 H 6 O 3 ) Ribose Pentose sugars (C 5 H 10 O 5 ) Glucose Galactose Hexose sugars (C 6 H 12 O 6 )
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Monosaccharides The simplest of the carbs: (CH 2 O) n Ketoses Ketoses Dihydroxyacetone Triose sugars (C 3 H 6 O 3 ) Pentose sugars (C 5 H 10 O 5 ) Ribulose Hexose sugars (C 6 H 12 O 6 ) Fructose
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Sugars: Ring Formation glucose linear form α glucose ring form β glucose ring form
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Disaccharides Formed by a dehydration reaction H 2 O α Glucose Maltose α, 1-4 glycosidic linkage α Glucose
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Disaccharides Formed by a dehydration reaction H 2 O Glucose Fructose Surcrose
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Polysaccharides Starch : an α glucose polymer (1-4 linkage) o
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Polysaccharides Cellulose : a β -glucose polymer (1-4 linkage) o
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Polysaccharides Tiny difference, huge consequence
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Polysaccharides Chitin Monomer: a glucosamine Chitin Polymer β , 1-4 glycosidic linkage
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Draw one linkage of the chitin polymer. Remember: I t uses β , 1-4 glycosidic linkages.
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This note was uploaded on 04/29/2008 for the course BIO V23.0011 taught by Professor Fitch during the Spring '08 term at NYU.

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Lecture 3 - biomolecules (used in class) 9-12 - 9.12.07...

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