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Ch.21 The Generation of Biochemical Energy
McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMcMurry 8th EditionCh.21 The Generation of Biochemical EnergyProblema 10b
Capitolo 21, Problema 10b

Look ahead to Figure 21.8 for the citric acid cycle.
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b. What class of enzymes carry out these reactions?

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1
Identify the reactions in the citric acid cycle shown in Figure 21.8. The citric acid cycle involves a series of chemical reactions that convert acetyl-CoA into carbon dioxide and high-energy electron carriers.
Understand that enzymes are biological catalysts that speed up chemical reactions. Each reaction in the citric acid cycle is facilitated by a specific enzyme.
Classify the enzymes based on the type of reaction they catalyze. For example, enzymes in the citric acid cycle include oxidoreductases (which catalyze oxidation-reduction reactions), lyases (which break bonds without water), and ligases (which form bonds using ATP).
Review the specific steps of the citric acid cycle to identify the enzyme classes involved. For instance, dehydrogenases (a type of oxidoreductase) are responsible for oxidation-reduction reactions, while synthetases (a type of ligase) are involved in bond formation.
Conclude that the citric acid cycle involves multiple classes of enzymes, with oxidoreductases being particularly prominent due to the cycle's role in transferring electrons to NAD+ and FAD to form NADH and FADH2.

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Citric Acid Cycle

The citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions used by all aerobic organisms to generate energy. It takes place in the mitochondria and involves the oxidation of acetyl-CoA to produce ATP, NADH, and FADH2, which are crucial for cellular respiration. Understanding this cycle is essential for grasping how energy is produced in cells.
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Citric Acid Cycle Summary Concept 12

Enzymes

Enzymes are biological catalysts that speed up chemical reactions in the body without being consumed in the process. They are typically proteins that lower the activation energy required for reactions, allowing metabolic processes to occur efficiently. In the context of the citric acid cycle, specific enzymes facilitate each step of the cycle, making them vital for its function.
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Intro to Enzymes Concept 1

Enzyme Classes

Enzymes are categorized into six main classes based on the type of reaction they catalyze: oxidoreductases, transferases, hydrolases, lyases, isomerases, and ligases. Each class plays a distinct role in metabolic pathways, including the citric acid cycle, where oxidoreductases are particularly important for oxidation-reduction reactions. Identifying the class of enzymes involved helps in understanding their specific functions within the cycle.
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Domanda del libro di testo

The hydrolysis of acetyl phosphate to give acetate and hydrogen phosphate ion has ∆G = -10.3 kcal/mol (-43.1 kJ/mol). Combine the equations and ∆G values to determine whether coupling of this reaction with phosphorylation of ADP to produce ATP is favorable. (You need give only compound names or abbreviations in the equations.)

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Domanda del libro di testo

Which of the following is found in the coenzyme FAD?

a. Two heterocyclic rings

b. ADP

c. A substituted benzene ring

d. A phosphate anhydride bond

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Domanda del libro di testo

Why, do you suppose, the coenzyme for the reaction in the citric acid cycle that is catalyzed by succinate dehydrogenase is FAD and not NAD+?

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Domanda del libro di testo

Look ahead to Figure 21.8 for the citric acid cycle.

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a. Draw the structures of the reactants in steps 3, 6, and 8, and indicate which hydrogen atoms are removed in these reactions.

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Domanda del libro di testo

Which of the reactants in the citric acid cycle have two chiral carbon atoms?

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Domanda del libro di testo

Identify the participants in the citric acid cycle that contain alcohol groups. Identify these groups as primary, secondary, or tertiary alcohols.

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