Human Physiology
15th Edition
ISBN: 9781259864629
Author: Fox, Stuart Ira
Publisher: Mcgraw-hill Education,
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Textbook Question
Chapter 4, Problem 15RA
The coenzymes NAD and FAD can "shuttle" hydrogens from one reaction to another. How does this process serve to couple
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The reaction pictured is an oxidation-reduction reaction in the citric acid cycle in which the energy-carrier molecule NADH is
generated. Identify which molecule in the reaction will be oxidized and which molecule will be reduced. Place a single answer
choice in each box.
COO-
HO-C-H
H-C-H
COO-
Malate
NAD+ NADH + H+
Oxidized
malate
oxaloacetate
COO-
H-C-H
ī
COO-
Oxaloacetate
Reduced
NADH
NAD+
How is ATP and hydrogen molecules used in the dark reaction? That is, what are these products for (or what exactly is the dark reaction “trying to accomplish” and how are the two products of the light reaction used for this purpose)?
Complete the following diagram, using arrows to show the flow of electrons, for this reaction
catalyzed by GAP dehydrogenase. Draw how the enzyme pocket appears as the reaction is completed.
Indicate the product (if any).
NAD+
ÇHOPO
он
Сys
Chapter 4 Solutions
Human Physiology
Ch. 4 - Use the lock-and-key model to explain how enzymes...Ch. 4 - Explain how enzymes are named, and the nature of...Ch. 4 - Draw graphs to represent the effects of changes in...Ch. 4 - Prob. 4CPCh. 4 - Prob. 5aCPCh. 4 - Prob. 5bCPCh. 4 - Prob. 5cCPCh. 4 - Prob. 6aCPCh. 4 - Define the terms exergonic reaction and endergonic...Ch. 4 - Prob. 7aCP
Ch. 4 - Prob. 7bCPCh. 4 - Which of these statements about enzymes is...Ch. 4 - Which of these statements about enzyme-catalyzed...Ch. 4 - Which of these statements about lactate...Ch. 4 - In a metabolic pathway, a. the product of one...Ch. 4 - In an inborn error of metabolism,
a. a genetic...Ch. 4 - Which of these represents an endergonic...Ch. 4 - Which of these statements about ATP is true? a....Ch. 4 - When oxygen is combined with 2 hydrogens to make...Ch. 4 - Enzymes increase the rate of chemical reactions...Ch. 4 - According to the law of mass action, which of...Ch. 4 - Explain the relationship between an enzyme's...Ch. 4 - Explain how the rate of enzymatic reactions may be...Ch. 4 - Explain how end-product inhibition represents a...Ch. 4 - Prob. 14RACh. 4 - The coenzymes NAD and FAD can "shuttle" hydrogens...Ch. 4 - Prob. 16RACh. 4 - Why do we need to eat food containing niacin and...Ch. 4 - Metabolic pathways can be likened to intersecting...Ch. 4 - Prob. 19RACh. 4 - Suppose you come across a bottle of enzyme tablets...Ch. 4 - Describe the energy transformations that occur...Ch. 4 - Use the reversible reactions involving the...Ch. 4 - Use the graph here and in figure 4.4 to answer the...Ch. 4 - Use the graph here and in figure 4.4 to answer the...Ch. 4 - Prob. 25RACh. 4 - Prob. 26RACh. 4 - Prob. 27RA
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- How is ATP and hydrogen atoms used in the dark reaction? That is, what are these products for (or what exactly is the dark reaction “trying to accomplish” and how are the two products of the light reaction used for this purpose)?arrow_forwardIndicate whether each of the following changes represents oxidation or reduction. Write: O = for oxidation ; R= for reduction Example: cyt ci (Fet) → cyt c1 (Fe2+) Answer: R Blank #1: COQH2 → CoQ Blank #2: NAD+ - NADH Blank #3: FMN → FMNH2 Blank # 4: FADH2 FAD Blank #5: Fe(III) SP → Fe(II) SP Blank # 1 Blank # 2arrow_forwardWhy do enzymes contain metals? What general reaction types to metalloenzymes catalyze?arrow_forward
- Which of the following is a cofactor and which is a coenzyme?(a) Cu2+ (b) Tetrahydrofolate(c) NAD+ (d) Mg2+arrow_forwardThe condensation reaction catalyzed by ß-ketoacyl-ACP synthase synthesizes a four-carbon unit by combining a two-carbon unit and a three-carbon unit, with the release of CO₂. What is the thermodynamic advantage of this process over one that simply combines two two-carbon units? The reaction is reversible and does not require the input of ATP. The exergonic release of CO₂ drives the irreversible reaction in the direction of fatty acid synthesis. The release of CO₂ is endergonic and results in the production of ATP. The reaction is endergonic and requires the input of ATP.arrow_forwardWhat does it mean to say that during cellular respiration, electron carriers are reduced while the food molecule is oxidized? How does this relate to the phrase “Redox reactions”?arrow_forward
- The coenzymes NAD+ and NADP+ are important electron carriers that pick up electrons from one pathway and deliver them to another. Below is a list of pathways or enzyme complexes that we have covered in class. Indicate which coenzyme these pathways or complexes produce by writing NAD+, NADP+, NADH or NADPH in the blank provided. ________ glycolysis ________ citric acid cycle ________ alcoholic fermentation ________ pyruvate dehydrogenase complex ________ gluconeogenesis ________ mitochondrial electron transport ________ photosynthesis light reactions ________ photosynthesis dark reactionsarrow_forwardThe reduced coenzymes NADH and FADH2 are oxidized in the ETS. What is the final electron acceptor of the ETS? What is the function of the H+ ion in ATP synthesis?arrow_forwardThe following statements describe the path of electrons from NADH through the electron transport chain. Please arrange them in order: Cytochrome c (Fe2+) carries electrons to Complex IV. Cytochrome c (Fe3+) is reduced to cytochrome c (Fe2+) QH2 carries electrons to Complex III Oxygen is reduced to water Ubiquinone (coenzyme Q) is reduced to ubiquinol (QH2)arrow_forward
- NADH is an important coenzyme in catabolic processes,whereas NADPH appears in anabolic processes. Explain how anexchange of the two can be effected.arrow_forwardDCCD (diocyclohexylcarbodiimide) inhibits oxidative phosphorylation when the substrate is mitochondrial NADH. DCCD is a drug that binds to ATP synthase and blocks proton transport through the ion channel. a) Explain what the consequences of DCCD on cellular energy production are. b) Suggest at least one other cellular effect of DCCD and explain this effect.arrow_forwardWhat are the metabolic roles of the coenzymes NAD+ and FAD?arrow_forward
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