Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 5, Problem 5.3CC
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A particular reaction has a ΔG‡ of 37.0 kJ mol-1. In the presence of an enzyme, the same reaction has a ΔG‡ of 5.70 kJ mol-1. Calculate the value of ΔΔG‡ in kJ mol-1.
The following questions are based on the reaction A+ B ↔ C+D shown in Figure 8.1.
1. Which of the following terms best describes the progress of the reaction with respect to free energy change?
a) endergonic, ∆G> 0
b) exergonic, ∆G> 0
c) exergonic, ∆G< 0
d) endergonic, ∆G< 0
2. Which of the following in Figure 8.1 remains unchanged by having an enzyme included?
a) b
b) d
c) a
d) c
3. The part labeled “C” on the above graph represents
a) Energy of activation without enzyme
b) Energy of activation with enzyme
c) Amount of free energy released
d) amount of energy required for the reaction progress
Which of the following statements is true? (a) The largerthe Q, the larger the ΔG°. (b) If Q = 0, the system is at equilibrium.(c) If a reaction is spontaneous under standardconditions, it is spontaneous under all conditions. (d) Thefree-energy change for a reaction is independent of temperature.(e) If Q > 1, ΔG > ΔG°.
Chapter 5 Solutions
Becker's World of the Cell (9th Edition)
Ch. 5 - How do phototrophs and chemotrophs depend...Ch. 5 - How does the spontaneity of a chemical reaction...Ch. 5 - QUESTION: Why does the height of the spike get...Ch. 5 - For a chemical reaction happening in a cell, what...Ch. 5 - Prob. 5.1PSCh. 5 - QUANTITATIVE Photosynthetic Energy Transduction....Ch. 5 - Energy Conversion. Most cellular activities...Ch. 5 - Problem Set Enthalpy, Entropy, and Free Energy....Ch. 5 - Violating the Second Law? The second law of...Ch. 5 - QUANTITATIVE The Equilibrium Constant. The...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- For a particular reaction, AH° = −16.1 kJ/mol and AS° = −21.8 J/(mol·K). Assuming these values change very little with temperature, at what temperature does the reaction change from nonspontaneous to spontaneous in the forward direction? OT= Is the reaction in the forward direction spontaneous at temperatures greater than or less than the calculated temperature? less than greater than Karrow_forwardThe enzyme phosphoglucomutase catalyzes the conversion of glucose 1-phosphate to glucose 6-phosphate. After the reactants and products were mixed and allowed to reach equilibrium at 25°C, the concentration of glucose 1-phosphate was 4.5 mM and that of glucose 6-phosphate was 86 mM. Calculate Keq' and AG for this reaction. The reaction coordinate diagram for an enzyme-catalyzed reaction is shown below. How many transition states and intermediates are in the reaction? Is the reaction thermodynamically favorable? Which step is the rate-determining step of the reaction? G Reaction coordinatearrow_forwardCan the thermodynamic property Δ G° be used to predict the speed of a reaction in a living organism? Why or why not?arrow_forward
- The equilibrium constant for the reaction Q → R is 25. Solve, (a) If 50 μM of Q is mixed with 50 μM of R, which way will the reaction proceed to generate more Q or more R? (b) Calculate the equilibrium concentrations of Q and R.arrow_forwardHow many net molecules of nucleoside triphosphate (ATP and equivalent molecules) are produced by complete aerobic catabolism of a glucose going through glycolysis, the pyruvate dehydrogenase complex and the citric acid cycle (TCA cycle)? Do not count the ATP eventually generated by re-oxidation of reduced coenzymes, just the number of NTPs produced in reactions of these pathways. Choose the one best answer. 02 03 04 05 06 8arrow_forwardAn enzyme-catalyzed reaction is allowed to proceed for 3.4 minutes under steady-state conditions (with large excess of substrate). If the enzyme concentration is 7.9 nM, and the concentration of product formed is 6.3 µM, what is the kcat of this enzyme? Please give your answer to two significant figures in s1.arrow_forward
- Given: Your professor gives you a vial of enzyme and a vial of substrate. The product of this reaction is fluorescent and you can measure the concentration of the product as a function of time. (answer a, b, and c)a) Your professor tells you to quantify how much product is being produced per minute at thebeginning of the experiment. What exactly are you measuring?b) On the same plot, show the kinetic curve for an increased quantity of enzyme. Assume a 2x concentration. Indicate Km and Vmax.c) You don’t have a computer hand. Sad. How can you plot the data such that you can get important Michaelis-Menten values?arrow_forwardConsider an enzyme (P) that gets activated by forming a dimer (P2): 2P = P2 At 25 °C, we have AH- 19 kJ/mol and AS-65 kJ/mol, for this dimerization reaction. Identify the correct statement. O The enzyme is activated when kept at temp = +37 °C. O The enzyme is activated at all temperatures. O The enzyme is activated when kept in the fridge with temp = 4 "C. O The enzyme can never be activated, no matter what the temperature is. O None of the above statements is true.arrow_forwardWhich of the following is TRUE under the following conditions: the enzyme concentration is 2.5 nM, substrate concentration is 75 nM, the KM = 150 nM, and the Vmax = 20 nmol/min a) The rate of the reaction is 20 nmol/min! b) The rate of the reaction is between 10 nmol/min and 20 nmol/min. c) The rate of the reaction is 10 nmol/min. d) The rate of the reaction is below 10 nmol/min. e) The rate cannot be determined from the above information.arrow_forward
- Balance each of the following redox reactions occurring in acidic solution. |-(aq)+NO-2(aq)→12(s)+NO(g)l-(aq)+NO2- (aq)→12(s)+NO(g) Express your answer as a chemical equation. Identify all of the phases in your answer. ClO-4(aq)+Cl-(aq)→CIO-3(aq)+CI2(g)CIO4- (aq)+Cl-(aq)→Cİ03-(aq)+Cl2(g) Express your answer as a chemical equation. Identify all of the phases in your answer. NO-3(aq)+Sn2+(aq)→Sn4+(aq)+NO(g)NO3- (aq)+Sn2+(aq)→Sn4+(aq)+NO(g) Express your answer as a chemical equation. Identify all of the phases in your answer.arrow_forwardList three effects of macromolecular crowding on the properties of enzymes and the reactions they catalyze.arrow_forwardWhat is a coupling reaction? Provide an example of a coupling reaction that occurs in cells.arrow_forward
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