{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

PracticeQuestions_Chapter03

# PracticeQuestions_Chapter03 - Consider a reaction X->Y in...

This preview shows pages 1–2. Sign up to view the full content.

Consider a reaction, X->Y in the cell at 25 o C. At equilibrium, [X] and [Y] are 50 μM and 5 μM, respectively. Using the following equations and what you know, answer the following questions. Δ G= Δ G o ’+1.4logQ (kcal/mol) (logZ is negative if Z<1, positive if Z>1, and 0 when Z=1. For example, log0.01=-2, log0.1=-1, log1=0, log10=1, log100=2). 1. What is the Δ G o ’ for X->Y (hint: at equilibrium, Δ G=0 and Q=K eq )? Is the conversion X->Y favored at standard condition? 2. For a circumstance in which [X] is 100 μM and [Y] is 1 μM. Is conversion of X to Y favorable? How fast the conversion will happen? 3. Suppose that starting conditions in which the reaction X Y is unfavorable. However, the cell needs to produce more Y. Which of the followings cells can do to have the conversion happen? A. Coupling the conversion to a reaction that can make the total free energy change a negative value. B. Reduce [Y] without increasing [X] so that 1.4logQ make the Δ G a negative value. C. Making more enzymes that catalyze the conversion. D. Decreasing Δ G o ’ by stabilizing the transition state between X->Y conversion. 4. Which one or more of the following reactions will NOT occur spontaneously under the standard conditions? A. ADP + Pi ATP Δ G °’ = +7.3 kcal/mole B. glucose-1-phosphate glucose-6-phosphate Δ G °’ = –1.7 kcal/mole C. glucose + fructose sucrose Δ G °’ = +5.5 kcal/mole D. glucose CO2 + H2O Δ G °’ = –686 kcal/mole 5. Any reaction A B is at equilibrium when A. Δ G = 0. B. Δ G °’ = 0. C. [A] = [B]. D. Δ G = Δ G °’. E. both forward and backward rates are zero. 6. Answer the following questions using either increased, decreased, or unchanged. A. If you dissolve sugar into water in a capped bottle, the total entropy of sugar and water in the bottle has _______. B. If you open the cap, water in the bottle will evaporate and sugar molecules will be crystallized eventually. Entropy of the sugar has ________ by crystallization. However, the entropy change of the sugar is compensated by the ___________ entropy by evaporation of the water molecules. 7. Living organisms require a continual supply of energy to exist because they

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 6

PracticeQuestions_Chapter03 - Consider a reaction X->Y in...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online