Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
8th Edition
ISBN: 9780134015187
Author: John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. Peterson
Publisher: PEARSON
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Chapter 1.11, Problem 1.4CIAP
A thermochromic plastic chip included in a shipping container for beef undergoes an irreversible color change if the storage temperature exceeds 28 °F. What is this temperature on the Celsius and Kelvin scales?
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The pyruvate dehydrogenase complex catalyzes the oxidative decarboxylation of pyruvate to form acetyl CoA. E₁, E2, and E3
are abbreviations for the enzymes of the complex. Classify the enzyme names, prosthetic groups, and reactions as E1, E2, or E3.
E₁
E2
Answer Bank
E3
transfer of electrons to FAD and then to NAD+
transfer of acetyl group to coenzyme A
formation of hydroxyethyl-TPP
hydroxyethyl group transferred to lipoamide
thiamine pyrophosphate (TPP)
FAD
lipoamide
dihydrolipoyl transacetylase
pyruvate dehydrogenase
dihydrolipoyl dehydrogenase
Patients with pyruvate dehydrogenase deficiency show high levels of lactic acid in the blood. However, in some cases, treatment
with dichloroacetate (DCA), which inhibits the kinase associated with the pyruvate dehydrogenase complex, lowers lactic
acid levels.
How does DCA act to stimulate pyruvate dehydrogenase activity?
DCA activates pyruvate dehydrogenase kinase.
DCA increases phosphorylation levels of pyruvate dehydrogenase.
DCA inhibits pyruvate dehydrogenase kinase.
ODCA activates pyruvate dehydrogenase phosphatase.
What does this suggest about pyruvate dehydrogenase activity in patients who respond to DCA?
The pyruvate dehydrogenase complex is active only when phosphorylated by the kinase.
The pyruvate dehydrogenase complex is active only in the presence of the kinase.
The pyruvate dehydrogenase complex is completely inactive.
The pyruvate dehydrogenase complex displays some residual activity.
Chapter 1 Solutions
Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
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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- The reduced coenzymes generated by the citric acid cycle donate electrons in a series of reactions called the electron-transport chain. The energy from the electron-transport chain is used for oxidative phosphorylation. Which compounds donate electrons to the electron- transport chain? H₂O NADH பப NAD+ ATP ADP FADH₂ FAD Which compounds are the final products of the electron-transport chain and oxidative phosphorylation? H₂O NADH NAD+ ΠΑΤΡ Π ADP FADH₂ FAD Which compound is the final electron acceptor in the electron-transport chain? Оно NADH NAD+ ATP ADP FADH₂ FADarrow_forwardHexokinase in red blood cells has a Michaelis constant (KM) of approximately 50 μM. Because life is hard enough as it is, let's assume that hexokinase displays Michaelis-Menten kinetics. What concentration of blood glucose yields an initial velocity (V) equal to 90% of the maximal velocity (Vmax)? [glucose] = What does the calculated substrate concentration at 90% Vmax tell you if normal blood glucose levels range between approximately 3.6 and 6.1 mM? Hexokinase operates near Vmax only when glucose levels are low. Hexokinase normally operates far below Vmax. Hexokinase operates near Vmax only when glucose levels are high. Hexokinase normally operates near Vmax mMarrow_forwardClassify each coenzyme or distinguishing characteristic based on whether it corresponds to catalytic or stoichiometric coenzymes. Catalytic coenzymes Answer Bank Stoichiometric coenzymes lipoic acid FAD used once coenzyme A regenerated thiamine pyrophosphate (TPP) NAD+arrow_forward
- The oxidation of malate by NAD+ to form oxaloacetate is a highly endergonic reaction under standard conditions. AG +29 kJ mol¹ (+7 kcal mol-¹) Malate + NAD+ oxaloacetate + NADH + H+ The reaction proceeds readily under physiological conditions. = Why does the reaction proceed readily as written under physiological conditions? The NADH produced during glycolysis drives the reaction in the direction of malate oxidation. The steady-state concentrations of the products are low compared with those of the substrates. The reaction is pushed forward by the energetically favorable oxidation of fumarate to malate. Endergonic reactions such as this occur spontaneously without the input of free energy. Assuming an [NAD+ ]/[NADH] ratio of 8, a temperature of 25°C, and a pH of 7, what is the lowest [malate]/[oxaloacetate] ratio at which oxaloacetate can be formed from malate? [malate] [oxaloacetate]arrow_forwardCalculate and compare the AG values for the oxidation of succinate by NAD+ and FAD. Use the data given in the table to find the E of the NAD+: NADH and fumarate:succinate couples, and assume that E for the enzyme-bound FAD: FADH2 redox couple is nearly +0.05 V. Oxidant Reductant " E' (V) NAD+ NADH + H+ 2 -0.32 Fumarate Succinate AG°' for the oxidation of succinate by NAD+: AG°' for the oxidation of succinate by FAD: 2 -0.03 Why is FAD rather than NAD+ the electron acceptor in the reaction catalyzed by succinate dehydrogenase? The electron-transport chain can regenerate FAD, but not NAD+. FAD is an oxidant, whereas NAD+ is a reductant. The oxidation of succinate requires two NAD+ molecules but only one FAD molecule. The oxidation of succinate by NAD+ is not thermodynamically feasible. kJ mol-1 kJ mol-1arrow_forwardUse the cellular respiration interactive to help you complete the passage. 2,4-dinitrophenol (DNP) was a popular ingredient in diet pills in the 1930s before it was discovered that moderate doses of the compound cause exceptionally high body temperature and even death. Complete the passage detailing how DNP's mechanism of action explains why it causes both high body temperature and weight loss. 2,4-dinitrophenol (DNP) causes of returning to the mitochondrial matrix through to pass directly across the inner mitochondrial membrane instead proteins. Because of DNP's effect on the mitochondrion, less energy is captured in the form of energy is instead wasted as heat. and more protons electrons ATP NADH sugars cytochrome ATP synthase heatarrow_forward
- To answer this question, you may reference the Metabolic Map. Select the reactions of glycolysis in which ATP is produced. 1,3-Bisphosphoglycerate 3-phosphoglycerate Glyceraldehyde 3-phosphate 1,3-bisphosphoglycerate Fructose 6-phosphate fructose 1,6-bisphosphate Phosphoenolpyruvate pyruvate Glucose glucose 6-phosphate Suppose 17 glucose molecules enter glycolysis. Calculate the total number of inorganic phosphate (P) molecules required as well as the total number of pyruvate molecules produced. P required: pyruvate produced: molecules moleculesarrow_forwardSuppose a marathon runner depletes carbohydrate stores after a four-hour run. The runner's nutritionist suggests replenishing carbohydrate stores by eating carbohydrates. However, the runner is also concerned about weight loss and wants to know if fats can be directly converted into carbohydrates. How should the nutritionist respond to the runner? Yes, the glyoxylate cycle can be used to convert acetyl CoA into succinate, which can then be converted into carbohydrates. No, the two decarboxylation reactions of the citric acid cycle preclude the net conversion of acetyl CoA into carbohydrates. No, the citric acid cycle converts acetyl CoA into oxaloacetate, but there is no pathway to form glucose from oxaloacetate. Yes, pyruvate carboxylase can convert acetyl CoA into pyruvate, which can be used to form glucose through gluconeogenesis.arrow_forwardThe crossover technique can reveal the precise site of action of a respiratory-chain inhibitor. Britton Chance devised elegant spectroscopic methods for determining the proportions of the oxidized and reduced form of each carrier. This determination is feasible because the forms have distinctive absorption spectra, as illustrated in the graph for cytochrome c. Upon the addition of a new inhibitor to respiring mitochondria, the carriers between NADH and ubiquinol (QH2) become more reduced, and those between cytochrome c and O₂ become more oxidized. Where does your inhibitor act? Complex I Complex II Complex III Complex IV Absorbance coefficient (M-1 cm x 10-5) 10 1.0 0.5 400 Reduced Oxidized 500 Wavelength (nm) 600arrow_forward
- Why are the electrons carried by FADH2 not as energy rich as those carried by NADH? FADH2 carries fewer high-energy electrons than NADH. OFADH2 is less negatively charged than NADH. OFADH2 has a lower phosphoryl-transfer potential than NADH. FADH₂ has a lower reduction potential than NADH. What is the consequence of this difference? Electrons flow from NADH to FADH2 before they are transferred to O₂. Electron flow FADH₂ to O, results in the production of more ATP than does electron flow from NADH. Electron flow from FADH₂ to O, pumps fewer protons than does electron flow from NADH. Electron flow from FADH, to O, consumes more free energy than does electron flow from NADH. A simple equation relates the standard free-energy change, AG", to the change in reduction potential, AE. AG=-FAE Then represents the number of transferred electrons, and F is the Faraday constant with a value of 96.48 kJ mol¹ V-¹. Use the standard reduction potentials provided to determine the standard free energy…arrow_forwardMatch each enzyme with its description. catalyzes the formation of isocitrate synthesizes succinyl CoA generates malate generates ATP converts pyruvate into acetyl CoA converts pyruvate into oxaloacetate condenses oxaloacetate and acetyl CoA catalyzes the formation of oxaloacetate synthesizes fumarate catalyzes the formation of a-ketoglutarate Answer Bank succinate dehydrogenase a-ketoglutarate dehydrogenase aconitase fumarase citrate synthase malate dehydrogenase pyruvate carboxylase pyruvate dehydrogenase complex isocitrate dehydrogenase succinyl CoA synthetasearrow_forwardcoo ☐ CH2 coo Malonate Determine how the concentration of each citric acid cycle intermediate will change immediately after the addition of malonate. The concentration of citrate will The concentration of isocitrate will The concentration of α-ketoglutarate will The concentration of succinyl CoA will The concentration of succinate will The concentration of fumarate will The concentration of malate will The concentration of oxaloacetate will Why is malonate not a substrate for succinate dehydrogenase? Malonate lacks a thioester bond that has high transfer potential. Malonate has two carboxylic acid groups. Malonate is not large enough to bind to the enzyme. Malonate only has one methylene group.arrow_forward
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