SI session Sept. 18 Ch. 5 and 6

SI session Sept. 18 Ch. 5 and 6 - Kaiser Imam September 18,...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

SI session Sept. 18 Ch. 5 and 6 - Kaiser Imam September 18,...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online