EBK FUNDAMENTALS OF GENERAL, ORGANIC, A
8th Edition
ISBN: 8220102895805
Author: Peterson
Publisher: PEARSON
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Chapter 1.12, Problem 1.25P
The sulfuric acid solution in an automobile battery typically has a specific gravity of about 1.27. Is battery acid more dense or less dense than pure water?
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From data in the table, calculate the AG value for the reactions.
Reaction
AG' (kJ/mol)
Phosphocreatine + H₂O →>> creatine + P
-43.0
ADP + Pi → ATP + H₂O
+30.5
Fructose +P → fructose 6-phosphate + H₂O
+15.9
Phosphocreatine + ADP creatine + ATP
AG'O
ATP + fructose → ADP + fructose 6-phosphate
AG'°
kJ/mol
kJ/mol
Macmillan Learning
The phosphorylation of glucose to glucose 6-phosphate is the initial step in the catabolism of glucose. The direct
phosphorylation of glucose by P, is described by the equation
Glucose + P
←
glucose 6-phosphate + H₂O
AG = 13.8 kJ/mol
Coupling ATP hydrolysis to glucose phosphorylation makes thermodynamic sense, but consider how the coupling might
take place.
Given that coupling requires a common intermediate, one conceivable mechanism is to use ATP hydrolysis to raise the
intracellular concentration of Pi. The increase in P; concentration would drive the unfavorable phosphorylation of glucose by Pi-
Is increasing the P; concentration a reasonable way to couple ATP hydrolysis and glucose phosphorylation?
No. The phosphate salts of divalent cations would be present in excess and precipitate out.
Yes. Increasing the concentration of P; would decrease K'eq and shift equilibrium to the right.
Yes. The extra ATP hydrolysis would provide enough free energy to drive the…
The phosphorylation of glucose to glucose 6-phosphate is the initial step in the catabolism of glucose. The direct
phosphorylation of glucose by P, is described by the equation
Glucose + P → glucose 6-phosphate + H₂O AG' = 13.8 kJ/mol
In principle, at least, one way to increase the concentration of glucose 6-phosphate (G6P) is to drive the equilibrium reaction to
the right by increasing the intracellular concentrations of glucose and Pj.
The maximum solubility of glucose is less than 1 M, and the normal physiological concentration of G6P is 250 μM. Assume a
fixed concentration of P, at 4.8 mM. The calculated value of K'cq is 4.74 × 10-³ M-¹.
Calculate the intracellular concentration of glucose when the equilibrium concentration of glucose 6-phosphate is 250 μM, the
normal physiological concentration.
[glucose] =
10.99
Correct Answer
Would increasing the concentration of glucose be a physiologically reasonable way to increase the concentration
of G6P?
No. Because the concentration of P,…
Chapter 1 Solutions
EBK FUNDAMENTALS OF GENERAL, ORGANIC, A
Ch. 1.2 - Pure acetic acid, which gives the sour taste to...Ch. 1.3 - Classify each of the following as a mixture or a...Ch. 1.3 - Classify each of the following as a physical...Ch. 1.3 - In the next image, red spheres represent element A...Ch. 1.3 - The active ingredient in aspirin, ASA, melts at...Ch. 1.3 - Prob. 1.2CIAPCh. 1.4 - Match the names of the elements described below...Ch. 1.4 - Identify the elements represented in each of the...Ch. 1.6 - Calomel (Hg2Cl2) is not toxic but methyl mercury...Ch. 1.6 - Give the full name of the following units and...
Ch. 1.8 - Prob. 1.8PCh. 1.8 - How would you record the temperature reading on...Ch. 1.8 - Prob. 1.10PCh. 1.8 - Convert the following values from scientific...Ch. 1.8 - Prob. 1.12PCh. 1.9 - Round off the following quantities to the...Ch. 1.9 - Carry out the following calculations, rounding...Ch. 1.10 - Prob. 1.15PCh. 1.10 - Convert 0.840 qt to milliliters in a single...Ch. 1.10 - A patient is to receive 20 mg of methimazole, a...Ch. 1.10 - Calculate the dosage in milligrams per kilogram...Ch. 1.11 - A thermochromic plastic chip included in a...Ch. 1.11 - A temperature-sensitive bath toy undergoes several...Ch. 1.11 - The highest land temperature ever recorded was 136...Ch. 1.11 - Prob. 1.20PCh. 1.11 - Prob. 1.21PCh. 1.11 - What is the specific heat of aluminum if it takes...Ch. 1.12 - A sample of pumice, a porous volcanic rock, weighs...Ch. 1.12 - Chloroform, once used as an anesthetic agent, has...Ch. 1.12 - The sulfuric acid solution in an automobile...Ch. 1.12 - Prob. 1.6CIAPCh. 1.12 - Prob. 1.7CIAPCh. 1 - The six elements in blue at the far right of the...Ch. 1 - Identify the three elements indicated on the...Ch. 1 - The radioactive element indicated on the following...Ch. 1 - (a)What is the specific gravity of the following...Ch. 1 - Assume that you have two graduated cylinders, one...Ch. 1 - State the length of the pencil depicted in the...Ch. 1 - Assume that you are delivering a solution sample...Ch. 1 - Assume that identical hydrometers are placed in...Ch. 1 - What is the difference between a physical change...Ch. 1 - Which of the following is a physical change and...Ch. 1 - Which of the following is a physical change and...Ch. 1 - Name and describe the three states of matter.Ch. 1 - Prob. 1.38ASPCh. 1 - Sulfur dioxide is a compound produced when sulfur...Ch. 1 - Butane (C4H8) is an easily compressible gas used...Ch. 1 - Classify each of the following as a mixture or a...Ch. 1 - Which of these terms, (i) mixture, (ii) solid,...Ch. 1 - Hydrogen peroxide, often used in solutions to...Ch. 1 - Prob. 1.44ASPCh. 1 - What is the most abundant element in the earths...Ch. 1 - Prob. 1.46ASPCh. 1 - Supply the missing names or symbols for the...Ch. 1 - Prob. 1.48ASPCh. 1 - Prob. 1.49ASPCh. 1 - Prob. 1.50ASPCh. 1 - Glucose, a form of sugar, has the formula C6H12O6....Ch. 1 - Prob. 1.52ASPCh. 1 - Prob. 1.53ASPCh. 1 - Prob. 1.54ASPCh. 1 - Prob. 1.55ASPCh. 1 - Prob. 1.56ASPCh. 1 - Prob. 1.57ASPCh. 1 - How many pictograms are in 1 mg? In 35 ng?Ch. 1 - How many microliters are in 1 L? In 20 mL?Ch. 1 - Prob. 1.60ASPCh. 1 - Prob. 1.61ASPCh. 1 - Prob. 1.62ASPCh. 1 - Prob. 1.63ASPCh. 1 - Prob. 1.64ASPCh. 1 - Round off each of the numbers in Problem 1.63 to...Ch. 1 - Carry out the following calculations, express each...Ch. 1 - Prob. 1.67ASPCh. 1 - Carry out the following conversions: (a) 3.614 mg...Ch. 1 - Carry out the following conversions. Consult...Ch. 1 - Express the following quantities in more...Ch. 1 - Fill in the blanks to complete the equivalencies...Ch. 1 - Prob. 1.72ASPCh. 1 - The muzzle velocity of a projectile fired from a 9...Ch. 1 - Prob. 1.74ASPCh. 1 - The Willis Tower in Chicago has an approximate...Ch. 1 - Prob. 1.76ASPCh. 1 - Prob. 1.77ASPCh. 1 - The white blood cell concentration in normal blood...Ch. 1 - Prob. 1.79ASPCh. 1 - Diethyl ether, a substance once used as a general...Ch. 1 - Prob. 1.81ASPCh. 1 - Calculate the specific heat of copper if it takes...Ch. 1 - Prob. 1.83ASPCh. 1 - A 150 g sample of mercury and a 150 g sample of...Ch. 1 - When 100 cal (418 J) of heat is applied to a 125 g...Ch. 1 - Prob. 1.86ASPCh. 1 - Prob. 1.87ASPCh. 1 - Prob. 1.88ASPCh. 1 - Prob. 1.89ASPCh. 1 - Prob. 1.90ASPCh. 1 - Ethylene glycol, commonly used as automobile...Ch. 1 - Prob. 1.92ASPCh. 1 - Prob. 1.93ASPCh. 1 - Prob. 1.94ASPCh. 1 - Prob. 1.95ASPCh. 1 - Prob. 1.96ASPCh. 1 - Prob. 1.97ASPCh. 1 - Prob. 1.98ASPCh. 1 - Prob. 1.99ASPCh. 1 - Approximately 75 mL of blood is pumped by a normal...Ch. 1 - Prob. 1.101CPCh. 1 - Prob. 1.102CPCh. 1 - Prob. 1.103CPCh. 1 - Prob. 1.104CPCh. 1 - Prob. 1.105CPCh. 1 - Prob. 1.106CPCh. 1 - Prob. 1.107CPCh. 1 - When 1.0 tablespoon of butter is burned or used by...Ch. 1 - Prob. 1.109CPCh. 1 - Prob. 1.110CPCh. 1 - Prob. 1.111CPCh. 1 - At a certain point, the Celsius and Fahrenheit...Ch. 1 - Prob. 1.113GPCh. 1 - Prob. 1.114GPCh. 1 - Sulfuric acid (H2SO4, density 1.83 g/mL) is...
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- Calculate the equilibrium constant for the phosphorylation of glucose to glucose 6-phosphate at 37.0 °C. K'eq = M-' In the rat hepatocyte, the physiological concentrations of glucose and P, are maintained at approximately 4.8 mM. What is the equilibrium concentration of glucose 6-phosphate (G6P) obtained by the direct phosphorylation of glucose by P.? [G6P] = Does this reaction represent a reasonable metabolic step for the catabolism of glucose? Why or why not? Yes, because the value of AG" is positive. No, because the K'eq is too large for the reaction to proceed in the forward direction. Yes, because AG is negative at the calculated value of K'eq No, because [G6P] is likely to be higher than the calculated value. Marrow_forwardThe pKa values for glutamic acid are 2.19, 9.67, 4.25. Sketch out the titration curve for this amino acid and include all of the pKa values and the pl.arrow_forwardCalculate the isoelectronic point, pl, from the pKa values for histidine, arginine and asparagine.arrow_forward
- The free energy released by the hydrolysis of ATP under standard conditions is -30.5 kJ/mol. If ATP is hydrolyzed under standard conditions except at pH 5.0, is more or less free energy released? Why? More free energy is released because the increased [H+] stabilizes the negative charge on the ADP molecule. Less free energy is released because an acidic environment depletes cellular ATP levels. Less free energy is released because the reaction favors ATP production over hydrolysis due to the higher [H+] in solution. More free energy is released because the total cellular concentrations of ATP, ADP, and P; are greater at the lower pH. Correct Answerarrow_forwardConsider a system consisting of an egg in an incubator. The white and yolk of the egg contain proteins, carbohydrates, and lipids. If fertilized, the egg transforms from a single cell to a complex organism. How does the entropy change in both the system (developing chick) and suroundings (the egg environment) drive the irreversible process of chick development? ☐ The release of glucose from sucrose, which produces energy needed for chick development, decreases entropy in the surroundings. Chick development increases entropy in the system, which causes a concominant decrease in entropy in the surroundings. Carbohydrates, proteins, and lipids within the egg break down into CO2 and H2O, which increases entropy in the surroundings. Chick development decreases entropy in the system, but this is smaller than the concominant increase in entropy in the surroundings.arrow_forwardThe amino acid glycine is often used as the main ingredient of a buffer in biochemical experiments. The amino group of glycine, which has a pKa of 9.6, can exist either in the protonated form -NH or as the free base -NH2, because of the reversible equilibrium R-NH =R-NH₂ + H+ In what pH range can glycine be used as an effective buffer due to its amino group? pH 8.6 to pH 10.6 In a 0.1 M solution of glycine at pH 9.0, what fraction of glycine has its amino group in the -NH form? Correct Answer Correct Answer 45 How much 5 M KOH must be added to 1.0 L of 0.1 M glycine at pH 9.0 to bring its pH to 10.0? 10 mL When 99% of the glycine is in its -NH form, what is the numerical relation between the pH of the solution and the pKa of the amino group? pH = pKa - 2 Correct Answer Correct Answerarrow_forward
- The glycolytic enzyme Phosphofructokinase (PFK) catalyzes the following reaction: Fructose-6-phosphate (F6P) + ATP → Fructose-1,6-bisphosphate (F1,6BP) + ADP AG"=-14.2 kJ/mol This is considered the enzymatic step that commits a sugar substrate to glycolysis. a) Calculate the standard free energy of hydrolysis of fructose-1,6-bisphosphate. b) What is the equilibrium constant for this coupled reaction? c) ATP is a known inhibitor of PFK. If the cellular concentrations of ATP and ADP are 5 mM and 1.0mM respectively, and the concentrations of F6P and F1,6BP are 2mM, what is the free energy change of the system?arrow_forward2) Consider the following reaction: A + 2B 3C + D At equilibrium the concentration of the reactants and products are: [A] = 20.0 mM [C] = 3.0 mM [B] = 4.0 mM [D] = 50.0 mM Calculate (a) the equilibrium constant and (b) AG". Comment on which side of this reaction is more likely to occur.arrow_forwardGlycine is a diprotic acid, which can potentially undergo two dissociation reactions, one for the a-amino group (NH), and the other for the carboxyl (-COOH) group. Therefore, it has two pK₁ values. The carboxyl group has a pK₁ of 2.34 and the α-amino group has a pK2 of 9.60. Glycine can exist in fully deprotonated (NH2-CH2-COO¯), fully protonated (NH3-CH2-COOH), or zwitterionic form (NH3-CH2-COO¯). Match the pH values with the corresponding form of glycine that would be present in the highest concentration in a solution of that pH. fully deprotonated form NH2-CH2-COO- fully protonated form NH–CH,–COOH zwitterionic form NH–CH,−COO Answer Bank pH 7.0 pH 11.9 pH 6.0 pH 8.0 pH 1.0arrow_forward
- The AG of hydrolysis of a sugar phosphate (S-O-P) to the free sugar (S-OH) is -26.6 kJ/mol in a hypothetical cell in which the steady-state concentrations of sugar phosphate, free sugar, and inorganic phosphate are 1.0 mM, 0.20 mM, and 50.0 mM, respectively. S-O-P + H2O S-OH + Pi (a) What is the AG°' for this reaction? (b) In the cell, S-O-P is formed by the transfer of a phosphate group from ATP. What would the AG be for the transfer of the g-phosphate from ATP to this sugar (S-OH)? [AG for ATP hydrolysis is -31 kJ/mol.]arrow_forward1) Consider the reaction: A B + C (a) What is the Keg for this reaction? AG= -8.80 kJ/mol (b) The reverse reaction is initiated by creating a solution containing 20mM B, 1mM A and 150mM C. At the instant these are mixed, what is the free energy change associated with the reaction?arrow_forwardWhat is the chemical importance of the negative charge on the phosphate group? Be asspecific as possible. In what ways might this negative charge have beenthermodynamically useful during the evolution of ATP-binding proteins?arrow_forward
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