ExtraCreditHomework7KEY - M dihydroxyacetone phosphate at...

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Name: KEY EID: Extra Credit Homework #7 Complete questions below and hand in to a TA by the end of class, Friday, October 21. 1. Within the neurons of an exotic organism, you discover a calcium transporter that uses the energy from GTP hydrolysis [in these cells you are studying, G(GTP + H 2 O GDP + P i ) = -71 kJmol -1 ] to pump Ca 2+ outside cells. How many Ca 2+ can be theoretically transported through the hydrolysis of one molecule of GTP if the membrane potential in these cells is –30 mV (inside negative), [Ca 2+ ] in = 1 µ M , [Ca 2+ ] out = 0.5 mM? Δ G t = RTln(C f /C i ) +ZF Δϕ Δ G t =(8.314 J/mol K) (310 K) ln (500 µ M/ 1 µ M) + 2 (96,500 J/V mol) (0.03 V) Δ G t = 21.8 kJ/mol Z=+2 Δϕ = ϕ f - ϕ i = 0.03 V (71 kJ/mol)/(21.8 kJ/mol) = >3, so can pass 3 Ca 2+ ions per GTP hydrolysis
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2. Triose phosphate isomerase (a glycolytic enzyme that interconverts dihydroxyacetone phosphate and glyceraldehyde 3-phosphate) is added to a solution of 250
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Unformatted text preview: M dihydroxyacetone phosphate at pH 7.0 and 37 C. When the reaction reaches equilibrium, what will be the concentrations of dihydroxyacetone phosphate and glyceraldehyde 3-phosphate? G = -RTlnK eq G =7.5 kJ/mol (given in your textbook) 7500 J/mol= -(8.314 J/mol)(310 K)(K eq ) K eq = e-2.91 = 0.054 = [G3P]/[DHAP]= [G3P]/(250 [G3P]) [G3P]= 236 [DHAP] =14 3. Draw the following molecules and indicate the number of electrons owned by each of the carbons: a) -D-glucopyranose O H HO H HO H OH OH H H OH C1=3 C2=4 C3=4 C4=4 C5=4 C6=5 Total: 24 b) ethanol H 3 C OH H H methyl carbon: 7 to hydroxyl carbon: 5 Total: 12 c) pyruvate O O O-H 3 C Methyl carbon: 7 Ketone carbon: 2 Carboxyl carbon: 1 Total: 10 d) D-lactate OH H 3 C O O-Methyl carbon: 7 to hydroxyl carbon: 4 Carboxyl carbon: 1 Total: 12...
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ExtraCreditHomework7KEY - M dihydroxyacetone phosphate at...

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