{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

SI session Sept. 20 Ch. 5 and 6

# SI session Sept. 20 Ch. 5 and 6 - Kaiser Imam BIOL 215 SI...

This preview shows pages 1–3. Sign up to view the full content.

Kaiser Imam September 20, 2007 BIOL 215 SI Session Chapters 5 and 6 Chapter 5: Bioenergetics 1. Write an equation to find Δ G’ that relates Δ G°’ and the [P]/[R] ratio. 2. Write an equation to find Δ G°’ . 3. Write an equation to relate Δ G’ and Δ G°’ . 4. 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 5. 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? 1

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

View Full Document
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 6. 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 go? 7. If the activation energy for an uncatalyzed reaction is + 25 kJ/mol, then what can you say about the activation energy for the enzyme catalyzed reaction? 8. Describe the difference between the lock-and-key model and the induced fit model for the fitting of a substrate into an enzyme’s active site. 9. An approximate "rule of thumb" is that the rate of a chemical reaction will double (reaction will go twice as fast) for every 10 °C increase in temperature. This observation 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 9

SI session Sept. 20 Ch. 5 and 6 - Kaiser Imam BIOL 215 SI...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online