BIOCHEMISTRY (LL)
9th Edition
ISBN: 9781337805100
Author: Campbell
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 10, Problem 32RE
RECALL How does proofreading take place in the process of
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
The standard cost of Product B manufactured by Oriole Company includes 3.5 units of direct materials at $5.40 per unit. During
June, 27,300 units of direct materials are purchased at a cost of $5.15 per unit, and 27,300 units of direct materials are used to
produce 7,600 units of Product B.
(a)
Compute the total materials variance and the price and quantity variances.
Total materials variance
Materials price variance
Materials quantity variance
$
(b)
Compute the total materials variance and the price and quantity variances, assuming the purchase price is $6.35 and the quantity
purchased and used is 26,300 units.
Total materials variance
Materials price variance
Materials quantity variance
$
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 10 Solutions
BIOCHEMISTRY (LL)
Ch. 10 - RECALL Define replication, transcription, and...Ch. 10 - REFLECT AND APPLY Is the following statement true...Ch. 10 - REFLECT AND APPLY Why is it more important for DNA...Ch. 10 - RECALL Why is the replication of DNA referred to...Ch. 10 - RECALL What is a replication fork? Why is it...Ch. 10 - Prob. 6RECh. 10 - RECALL Why is it necessary to unwind the DNA helix...Ch. 10 - REFLECT AND APPLY In the MeselsonStahl experiment...Ch. 10 - REFLECT AND APPLY Suggest a reason why it would be...Ch. 10 - RECALL Do DNA-polymerase enzymes also function as...
Ch. 10 - RECALL Compare and contrast the properties of the...Ch. 10 - REFLECT AND APPLY Define processivity, and...Ch. 10 - REFLECT AND APPLY Comment on the dual role of the...Ch. 10 - REFLECT AND APPLY What is the importance of...Ch. 10 - REFLECT AND APPLY DNA synthesis always takes place...Ch. 10 - REFLECT AND APPLY What would happen to the...Ch. 10 - Prob. 17RECh. 10 - REFLECT AND APPLY Why is it not surprising that...Ch. 10 - Prob. 19RECh. 10 - RECALL List the substances required for...Ch. 10 - RECALL Describe the discontinuous synthesis of the...Ch. 10 - RECALL What are the functions of the gyrase,...Ch. 10 - RECALL Single-stranded regions of DNA are attacked...Ch. 10 - RECALL Describe the role of DNA ligase in the...Ch. 10 - RECALL What is the primer in DNA replication?Ch. 10 - Prob. 26RECh. 10 - REFLECT AND APPLY Why is a short RNA primer needed...Ch. 10 - Prob. 28RECh. 10 - RECALL What was the recent change in the estimated...Ch. 10 - Prob. 30RECh. 10 - RECALL Why is a clamp loader necessary in...Ch. 10 - RECALL How does proofreading take place in the...Ch. 10 - Prob. 33RECh. 10 - Prob. 34RECh. 10 - BIOCHEMICAL CONNECTIONS Of what benefit is it for...Ch. 10 - REFLECT AND APPLY Your book contains about 2...Ch. 10 - REFLECT AND APPLY E. coli incorporates...Ch. 10 - REFLECT AND APPLY Given the typing speed from...Ch. 10 - Prob. 39RECh. 10 - REFLECT AND APPLY How can breakdown in DNA repair...Ch. 10 - Prob. 41RECh. 10 - RECALL What is a direct way of repairing...Ch. 10 - Prob. 43RECh. 10 - Prob. 44RECh. 10 - Prob. 45RECh. 10 - Prob. 46RECh. 10 - RECALL How did Messelson and Weigle demonstrate...Ch. 10 - Prob. 48RECh. 10 - RECALL What is the Holliday Model?Ch. 10 - RECALL Do eukaryotes have fewer origins of...Ch. 10 - RECALL How does DNA replication in eukaryotes...Ch. 10 - Prob. 52RECh. 10 - REFLECT AND APPLY (a) Eukaryotic DNA replication...Ch. 10 - Prob. 54RECh. 10 - Prob. 55RECh. 10 - Prob. 56RECh. 10 - Prob. 57RECh. 10 - Prob. 58RECh. 10 - Prob. 59RECh. 10 - Prob. 60RECh. 10 - Prob. 61RECh. 10 - Prob. 62RECh. 10 - Prob. 63RECh. 10 - Prob. 64RE
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biochemistry and related others by exploring similar questions and additional content below.Similar questions
- 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
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
BiochemistryBiochemistryISBN:9781305961135Author:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougalPublisher:Cengage Learning
Biochemistry
Biochemistry
ISBN:9781305961135
Author:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal
Publisher:Cengage Learning
Biomolecules - Protein - Amino acids; Author: Tutorials Point (India) Ltd.;https://www.youtube.com/watch?v=ySNVPDHJ0ek;License: Standard YouTube License, CC-BY