SI session Sept. 18 Ch. 5 and 6

# SI session Sept. 18 Ch. 5 and 6 - Kaiser Imam BIOL 215 SI...

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Kaiser Imam September 18, 2007 BIOL 215 SI Session Chapters 5 and 6 Chapter 5: Bioenergetics 1. Write the (P/R) ratio for the following process: 2A + 3B 4C + 5D 2. Write an equation to find Δ G’ . 3. Write an equation to find Δ G°’ . 4. Write an equation to relate Δ G’ and Δ G°’ . 5. Fill in the following table: Sign of Δ G°’ Spontaneous or Non-spontaneous (P/R) cell ? K eq Direction of Reaction Can work be done? < 0 > 0 = 0 6. Using information from the table below determine if each of the following reactions is thermodynamically favorable. 1

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Reaction Δ H -TΔ S C 6 H 12 O 6 → 2C 2 H 5 OH + 2CO 2 -82 kJ/mol -136 kJ/mol 2CO 2 + 3H 2 O → C 2 H 5 OH + 3O 2 +1367 kJ/mol -41 kJ/mol N 2 O 5 → 2NO 2 + 1/2O 2 +110 kJ/mol -140 kJ/mol 7. The interconversion of dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3- phosphate (G3P) is part of the glycolytic pathway for producing energy for the cell. DHAP ↔ G3P The value for Δ G°’ for this reaction is +1.8 kcal/mol at 25 °C. In the glycolytic pathway, this reaction goes to the right, converting DHAP to G3P. a) In which direction does equilibrium lie? What is the equilibrium constant at 25 °C? b) In which direction does this reaction proceed under standard conditions? What is the Δ G’ for the reaction in that direction? c) In the glycolytic pathway, this reaction is driven to the right because G3P is consumed by the next reaction in the sequence, thereby maintaining a low G3P concentration. What will Δ G’ be (at 25 °C) if the concentration of G3P is maintained at 1% of the DHAP concentration (i.e., if [G3P]/[DHAP] = 0.01)? Chapter 6: Enzymes 2
8. Suppose that the standard free energy change for an uncatalyzed reaction (S ↔ P) is +60 kJ/mol, and a specific enzyme enhances the rate of the reaction by 10 7 -fold. Under standard conditions in the presence of the enzyme, in which direction will the reaction

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SI session Sept. 18 Ch. 5 and 6 - Kaiser Imam BIOL 215 SI...

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